100道简便运算带答案简单例题

100道简便运算带答案简单例题
100道简便运算带答案简单例题

100道简便运算带答案简单例题1、34×3.535-3.5×34.34

=34×3.5×1.01-3.5×34×1.01

=0

2、8+89+899+8999+89999

=9+90+900+9000+90000-5

=99999-5

=99994

3、0.67×2.1+0.018×21+8.5×0.79

=0.67×2.1+0.18×2.1+8.5×0.79

=(0.67+0.18)×2.1+8.5×0.79

=0.85×2.1+0.85×7.9

=0.85×(2.1+7.9)

=0.85×10

=8.5

4、22222.2×9.99999

=22222.2×(10-0.00001)

=222222-0.222222

=222221.777778

5、1997×19961996-1996×19971997

=1997×1996×10001-1996×1997×10001

6、0.02+0.04+0.06+0.08+……+19.94+19.96+19.98 =(0.02+19.98)×999÷2

=10×999

=9990

7、99999×77778+33333×66666

=99999×77778+99999×22222

=99999×(77778+22222)

=99999×100000

=9999900000

8、(4又5/6-3又3/4)/(3/14+2/7)

=13/12÷1/2

=13/6

=2又1/6

9、(4.8/1又4/5+3又1/2+7又1/3)*4/9

=(2又2/3+7又1/3+3.5)*4/9

=(10+3.5)*4/9

=13.5*4/9

=6

10、17.2/【(3又2/5-1.25)*2/3】

=17.2/【2.15*2/3】

=17.2÷43/3

11、5*5又1/5

=5*5+5*1/5

=25+1

=26

12、(5又2/5-1.8)/[(1.15+13/20)*1又2/3] =3.6/[1.8*5/3]

=3.6/3

=1.2

13、3又5/8*5又1/5+5又1/5*6又3/8

=5.2*(3又5/8+6又3/8)

=5.2*10

=52

14、[3/4-7/8/(5/6+4/5)]*28

=[3/4-7/8÷49/30]*28

=[3/4-15/28]*28

=3/4*28-15/28*28

=21-15

=6

15、(1.25*4/5-0.76)/(1又3/8+1又1/40)

=(1-0.76)/2.4

=0.24/2.4

分数乘除法简便运算100题(有答案)

分数乘除法简便运算100题(有答案) (1)(89 +427 )×3 ×9 (2)(38 - 38 )× 615 (3) 16 ×(7 - 23 ) (4) 56 ×59 + 59 × 16 (5)29 ×34 +527 × 34 (6) 613 ×75 - 613 × 2 5 (7) 712 ×6 - 512 × 6 (8)38 +38 ×47 +38 ×3 7 (9) 37× 335 (10) 6 25 × 24 (11)1521 ×34 + 1021 ×34 - 34 (12)710 ×101- 7 10 (13) 89 ×89 —89 ×89 (14) 35 × 99 + 3 5 (15) ( 47 + 89 )×7 ×9 (16)34 5 ×25 (17) 36× 3435 (18) ( 56 - 59 )×18 5 (19)2623 × 15 (20)3225 ×5 6 (21) ??? ??+÷5121101 (22) 5 7535÷??? ??+ (23)87748773÷+÷ (24) 91 929197÷-÷

(25) ??? ??+?652053 (26)12 5 9412595÷+÷ (27)38 - 38 ×47 - 38 ×37 (28)6237 63? (29) 31÷76+32÷7 6 (30)229 ×(15×2931 )

(31) 58 ×23 ×815 (32)253 4 ×4 (33)54×(89 - 56 ) (34)721245187 1211÷??? ? ?++ (35) 38 31162375.011583÷ -?+? (36)1925214251975?+?+ (37) 4818365÷??? ??+ (38) 241 241343651211÷??? ? ?-+- (39) 115925119 7?+÷ (40) 341574357834265÷+?+÷ (41) 8 83 88 3?÷? (42) ??? ??++÷??? ??++12191711259575 (43) 6 .035 2444533533-÷+?+÷ (44)6.8× 51+51×3.2 (45) 101×25 4 (46) 85+85×1 5 (47)8158÷8 (48) 31×76+32×7 6 (49)( 90+881)×891 (50)57×38+58×5 7 (51)815×516+527÷109 (52)18×(49+5 6 ) (53)23×7+23×5 (54)(16-112)×(24-4 5) (55)(57×47+47)÷47 (56)15÷[(23+15)×1 13 ] (57) 833×117+114×833 (58)3 1 333×3 (59) 5912512795÷+? (60) 6 5 524532-?+ (61) (32× 41+17)÷125 (62)(25+43)÷41+4 1

分数乘除法简便运算100题(有答案)

分数乘除法简便运算 100题(有答案) 8 3 3 6 ⑴(9 + 27 )x 3 x 9 (2) (8 - 8 ) x — (3) 5 5 5 1 (4) T x- + -x — '丿6 9 9 6 2 3 5 3 (5)— x + x —9 4 27 4 (6) 6 7 x- 13 5 13 (7) 12 (8) +_ 8 8 (9) 37X 3 35 (10) 6 25 x 24 (11) 15 3 10 3 x - + x- 21 4 21 4 (12) x 7

(14) x 99 + 5 5 4 8 4 (15) ( 7 + 9)x7 x9 (16) 35 x 25 34 5 5 18 (17) 36x35 (18) ( 6 - 9 3 7 4 7 7 丄_2 丄 (23)7 8 7 8(24) 9 9 9 9 (13) (19) 263x X 1 1 (21) 10 2 5 (22) 35 7 5

(巩 3 4 3 3 —x --.—x- 8 7 8 7 (29 ) (31)5 2 8 x x —8 3 15 8 5 (33) 54X( 9 - 6 ) (35) 11 5 3 丄 68 48 5 (26) 5 9 (28) 63 2 (3°)29 5 12 37 62 4 5 9 12 29 x (15 X31 3 (32) 254 X 4 11 Z 2 丄(34) 12 18 24 72 0.375 2— 3 8 11 3 5聖4刃(36) 7 25 25 19 11 5 3 13 1 12 6 4 24 24 (38)

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分数乘除法简便运算100题(有答案)

分数乘除法简便运算专题练习 615 X 3_ 8 - 3_ 8 /( \ 2 9 X 3 X 4 27 + 8_ 9 1- 6 X 5- 9 + 5- 9\| 7 2- 3 - 7 /( \ X 1 - 6 3) 2 - 5 X 6- 13 - 7- 5 X 613 6 X 527 + 3- 4 X 2- 9 5) (8) (7) 17 2 X 6 -寻 X 6 (10) 25 X 24 3 35 37 X (9) 7 10 X 101- 15 3 10 3 X- + X 21 4 21 4 (11)

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(完整版)分数乘除法简便运算100题(有答案).doc

分数乘除法简便运算100 题(有答案) ( 1)(8 4 )× 3 × 9 ()( 3 3 )× 6 9 + 27 2 8 - 8 15 ( 3)1 2 5 5 5 1 6 ×( 7 - 3 )(4) 6 ×9 + 9 ×6 ( 5)2 ×3 5 × 3 () 6 × 7 6 ×2 9 4 + 27 4 6 13 5 - 13 5 7 5 3 3 4 3 3 ( 7)12× 6 - 12× 6 (8)8 + 8×7 + 8×7 ( 9) 37×3 ( 10 ) 6 × 24 35 25 15 3 10 3 3 7 7 ( 11)21 × 4 + 21 ×4 - 4 (12)10×101- 10

8 8 8 8 3 3 ( 13) 9 ×9 — 9 ×9 (14) 5 × 99 + 5 4 8 4 ( 15)( 7 + 9 ) ×7 ×9 (16) 35 × 25 34 5 5 18 ( 17) 3 6 × 35 ( 18) ( 6 - 9 ) × 5 2 1 2 5 ( 19)263 × 5 (20)325 ×6 1 1 1 35 5 ( 21) 10 5 2 5 ( 22) 7 3 7 4 7 7 1 2 1 (23) 7 8 7 8 ( 24) 9 9 9 9 ( 25) 3 20 5 ( 26) 5 5 4 5 5 6 9 12 9 12

3 3 4 3 3 37 ( 27) 8 - 8 ×7 - 8 ×7 (28)63 62 ( 29)1 ÷ 6 + 2 ÷ 6 () 2 ×(15 ×29 ) 3 7 3 7 30 29 31 5 2 8 3 ( 31)8×3×15 (32) 254×4 8 5 11 7 5 1 (34) 12 18 24 72 ( 33)54×( - ) 9 6 ( 35) 3 5 0.375 2 6 3 8 5 19 4 21 19 8 11 11 3 (36) 7 2 5 25 5 3 1 11 5 3 13 1 (37) 6 8 48 (38) 12 6 4 24 24

小数简便计算题100道

3.56+ 4.54+6.44+ 5.46 5.03-0.25-1.75 4.86+ 5.24-1.86 8.13+(1.87-0.5) 23.7-1.6-3.7-8.4 87.4-(21.25+17.4) -8.75 14.6-9.9 1.9+1.99+1.999 19.43-(6.72+1.43) 2.69-1.35+3.31-2.65 17.28-3.86-6.14+2.72 5.25+3.76-2.76+4.75 4.5+5.5-4.5+5.5 21.53-(13.64-8.47) 28.49-1.1-2.47-6.43 7.34+2.5+2.66-1.5 3.25+1.79-0.59+1.75 3.79-1.225-(3.775-6.21) 27.38-5.34+2.62- 4.66 4.12+8.59+ 5.88+1.41 12.87-1.34-2.66 21.53+4.87-2.53 15.21+(4.79-2.8)

12.19-2.6-2.19-3.4 109.72-(5.62+9.72) 21.3-19.9 39.6-(18.31+9.6) -1.69 14.25-2.45+5.75-3.55 24.51-3.14-6.86+4.49 41.25+5.87-3.87+4.65 11.5+8.5-11.5+8.5 8.13-(12.25-11.87) 34.34-2.1-2.35-5.55 81.67+4.17+4.33-2.17 1.35+12.87-1.37+8.65 15.51-3.334-(2.666-4.49) 21.62-4.35+8.38-5.65 0.125×3.69×8 (2.5-0.25) ×4 8.59×101 0.36×15.7-0.36×13.7 5.64×1.28+8.72×5.64 0.63×199 60÷48 7.73×0.5+2.27÷2 4.37+99×4.37 10.1×38.67-3.867 9.9÷ 5.5

分数乘除法简便运算100题(有答案)

? ?? ??+÷5121101分數乘除法簡便運算100題 (1)(89 +427 )×3 ×9 (2)(38 - 38 )× 615 (3) 16 ×(7 - 2 3 ) (4) 56 ×59 + 59 × 16 (5)29 ×34 +527 × 34 (6) 613 ×75 - 613 × 2 5 (7) 712 ×6 - 512 × 6 (8)38 +38 ×47 +38 ×37 (9) 37× 3 35 (10) 6 25 × 24 (11)1521 ×34 + 1021 ×34 - 34 (12)710 ×101- 710 (13) 89 ×89 —89 ×89 (14) 35 × 99 + 35 (15) ( 47 + 8 9 )×7 ×9 (16)345 ×25 (17) 36×3435 (18) ( 56 - 59 )×18 5 (19)262 3 × 15 (20)3225 ×56 (21)

5 7535÷??? ?? +(22) (23)87748773÷+÷ (24) 91929197÷-÷ (25) ??? ??+?652053 (26)12 5 9412595÷+÷ (27)38 - 38 ×47 - 38 ×37 (28)623763? (29) 31÷76+32÷76 (30)229 ×(15×2931 ) (31)58 ×23 ×815 (32)2534 ×4 (33)54×(89 - 5 6 ) (34)7212451871211÷??? ??++(35)38 31162375.011583÷ -?+? (36)1925214251975?+?+ (37)4818365÷??? ??+ (38) 241241343651211÷??? ??-+- (39) 115 9251197?+÷ (40) 341574357834265÷ +?+÷(41)883 883?÷? (42) ??? ??++÷??? ??++12191711259575

分数乘除法简便运算100题(有答案)

分数乘除法简便运算100题 (1)(89 +427 )×3 ×9 (2)(38 - 38 )× 615 (3) 16 ×(7 - 23 ) (4) 56 ×59 + 59 × 16 : (5)29 ×34 +527 × 34 (6) 613 ×75 - 613 × 2 5 (7) 712 ×6 - 512 × 6 (8)38 +38 ×47 +38 ×37 (9) 37× 335 (10) 6 25 × 24 (11)1521 ×34 + 1021 ×34 - 34 (12)710 ×101- 7 10 (13) 89 ×89 —89 ×89 (14) 35 × 99 + 3 5 (15) ( 47 + 89 )×7 ×9 (16)34 5 ×25 (17) 36×3435 (18) ( 56 - 59 )×18 5 (19)2623 × 15 (20)3225 ×5 6 ^ (21) ??? ??+÷5121101 (22) 5 7535÷??? ??+

(23)87748773÷+÷ (24)91929197÷-÷ (25) ?? ? ? ?+?652053 (26)12 5 9412595÷+÷ (27)38 - 38 ×47 - 38 ×37 (28)62 37 63? (29) 31÷76+32÷76 (30)229 ×(15×2931 ) (31) 58 ×23 ×815 (32)253 4 ×4 (33)54×(89 - 5 6 ) (34)72 1245187 1211÷??? ??++ (35) ( (36) 3831162375.011583÷ -?+? (36)192521 4251975?+?+ (37) 4818365÷??? ??+ (38) 241 241343651211÷??? ??-+- (39) 115925119 7?+÷ (40) 341574357834265÷+?+÷ (41) 8 83 88 3?÷? (42) ??? ??++÷??? ??++12191711259575 (43) 6 .035 2444533533-÷+?+÷ (44)× 51+51× (45) 101×25 4 (46) 85+85×1 5 (47)8158 ÷8 (48) 31×76+32×7 6 (49)( 90+881)×891 )

分数乘除法简便运算100题(有答案)精编版

分数乘除法简便运算100题(有答案) (1)(89 +427 )×3 ×9 (2)(38 - 38 )× 615 (3) 16 ×(7 - 23 ) (4) 56 ×59 + 59 × 16 (5)29 ×34 +527 × 34 (6) 613 ×75 - 613 × 2 5 (7) 712 × 6 - 5 12 × 6 (8)38 +38 ×47 +38 ×37 (9) 37× 335 (10) 6 25 × 24 (11) 1521 ×34 + 1021 ×34 - 34 (12)710 ×101- 710 (13) 89 ×89 —89 ×89 (14) 35 × 99 + 3 5 (15) ( 47 + 89 )×7 ×9 (16)34 5 ×25 (17) 36× 3435 (18) ( 56 - 59 )×18 5 (19)262 3 × 15 (20)3225 ×56 (21) ??? ??+÷5121101 (22) 5 7535÷??? ??+ (23)87748773÷+÷ (24)91 929197÷ -÷ (25) ??? ??+?652053 (26)12 5 9412595÷+÷

(27)38 - 38 ×47 - 38 ×37 (28)6237 63? (29) 31÷76+32÷76 (30)229 ×(15×2931 ) (31) 58 ×23 ×815 (32)253 4 ×4 (33)54×(89 - 56 ) (34)721245187 1211÷??? ? ?++ (35) 3831162375.011583÷ -?+? (36)192521 4251975?+?+ (37) 4818365÷??? ??+ (38) 241 241343651211÷??? ? ?-+- (39) 115925119 7?+÷ (40) 341574357834265÷+?+÷ (41) 8 83 88 3?÷? (42) ??? ??++÷??? ??++12191711259575 (43) 6 .035 2444533533-÷+?+÷ (44)6.8×5 1+ 5 1×3.2 (45) 101×254 (46) 85+85×15 (47)8158÷8 (48) 31×76+32×7 6 (49)( 90+881)×891 (50)57×38+58×5 7 (51)815×516+527÷109 (52)18×(49+5 6) (53)23×7+23×5 (54)(16-112)×(24-4 5) (55)(57×47+47)÷47 (56)15÷[(23+15)×1 13] (57) 833×117+114×833 (58)3 1 333×3

五年级上册简便运算练习题及答案-精选

五年级上册简便运算练习题及答案请用简便方法计算下列各题 0.25X 0.20.125< 3.2X 2.535< 40.2 0.25X 4- 0.25X 4.5X 9.93.5X 99+3.5 3.5X 10^-3.53.5 3.5X 2.7 - 3.5X 0.7 4.9+ 3.5 7.3貝.35 3.29+0.73+2.273.29-0.73-2.2.5+2.5-7.5+2.5 7.325-3.29- 3.32.325-7.325- X 9.9+3.5X 0.1.5+ 0..5 + 0.2 ■ ■》 7.325 X 2.7+3X 0.7- 0.6 - 0.貝0.+ 0.12^8 3.29+0.73- 2.29+2.23.29X 0.25X 0.12X5 8.8 63半2.5- 0..9 + 1.4.9一 + 0.7 0.35X 1.25X 2X 0.8

28.6X 101-28.6 14 -7.32-2.62.64 X 0.4 7.6X 0.8+0.2X 7.6 0.25X 36 2.5X 2.432.4X 0.9 +0.1X 32.40.86X 15.7 - 2016全新精品资料- 全新公文范文-全程指导写作-独家原创 1/ 8

0.5X 9.163.60.85< 19 X 3.2X 2.552.片45 15^ 0.252.4< 102.3X1.2X 0.5 3.6< 0.0.25< 8.5< 4< 40.2 0.125 五年级数学简便计算练习卷四 7.6X 0.8+0.2X 7.60.85X 190.2X5 8.5X4 1.28X 8. 6 +0.72X 8. 1 2.5X 0.96X 0.810.4 9.6X 0.35 0.8X 3.12+3.12X 9928.X6 101-28.6 0.86X 15.7-0.86X 14..4X 102.3X1 1.2X 0.5 14 —7.32- 2.62.64+ 8.67+ 7.36+ 11.30- 28 X 0.49.16X 1.5-0.5X 9.163.6-3.6X 0.5 4.5- 1..2- 3.30- 0.6-5 63.4- 2.5- 0.4.9- 1.4.9 - 0.72.5X 2..7- 15- 1010.87- 0.91810.716.1 - 15.110.70.79199

四年级简便计算100道带答案(每天10道)

第一天 (125+25)×4 127+352+73+4 75+276+135+24 5+204+335+96 25+71+75+29+88 243+89+111+57 399+(154+201) 480+325+75 78+53+47+89+11 36+18+64 答案:600 556 510 640 288 500 754 880 278 118 第二天 168+250+32 85+41+15+59 78+46+154

130-46-34 263-96-104 970-132-68 400-185-15 472-126-124 168-28-72 437-137-63 答案:450 200 278 50 63 770 200 222 68 237 第三天 244+182+56 200-173-27 124+68+76 263-96-104 970-132-68 400-185-15 772-168-132 603+421 745-305 951-395

答案:482 0 368 63 770 200 472 10241 440 556 第四天 19+199+1999 34+304+3004 798+321 325-156+675-144 9999+999+99+9+4 65×5×2 8+98+998+9998 582-157-182 25×23×4 36×25 答案:2217 3342 832 700 11110 650 11102 243 2300 900 第五天 25×125×32 35×22 540÷45÷2 25×32 5×(63×2) 540÷36 216+305 6×(15×9)

四年级数学整数简便运算120道(有答案)

四年级数学整数简便运算120道(有答案) (1) 67+42+33+58 (2) 258-58-26-74 (3) 125×16 (4) 50×(2×4)×25 (5) 7×8×3×125 (6) 26×103 (7) 501×12 (8) 25×(40+8)(9) 39×14+61×14 (10) 163×8+37×8 (11) 202×13 (12) 77×4×5 (13) 27×99 (14) 48×250 (15) 98+303 (16) 49+49×49 (17) 55×25+25×45 (18) 123×67-23×67

(19) 39×101-39 (20) 99×64+64 (21) 76×23+24×23 (22) 12+19×12 (23) 21+254+79+46 (24)25×16×5 (25)52×32+48×32 (26)18×137-18×37 (27)450÷18 (28)420÷35 (29)480÷15 (30)21×99 (31)125×32 (32)12×301 (33)75×3×4 (34)19+99×19 (35)256×9-46×9 (36)13+13×49 (37)(25+125)×8 (38)541×67-67×441

(39)43×201 (40)102×35 (41)304×22 (42)(30+4)×25 (43)38×7+62×7 (44)152×8+148×8 (45)16×401 (46)103×23 (47)(30+2)×15 (48)125×(8+16)(49)68×48+68×2 (50)5×27+63×5 (51)12×(40-5)(52)64×9-14×9 (53)35×98 (54)23×134-34×23 (55)102×45 (56)648+203 (57)98×32 (58)44×25

分数乘除法简便运算100题(有答案)

? ?? ??+÷5121101分數乘除法簡便運算100題 (1)(89 +427 )×3 ×9 (2)(38 - 38 )× 615 (3) 16 ×(7 - 2 3 ) (4) 56 ×59 + 59 × 16 (5)29 ×34 +527 × 34 (6) 613 ×75 - 613 × 2 5 (7) 712 ×6 - 512 × 6 (8)38 +38 ×47 +38 ×37 (9) 37× 335 (10) 625 × 24 (11)1521 ×34 + 1021 ×34 - 34 (12)710 ×101- 7 10 (13) 89 ×89 —89 ×89 (14) 35 × 99 + 35 (15) ( 47 + 8 9 )×7 ×9 (16)345 ×25 (17) 36×3435 (18) ( 56 - 59 )×18 5 (19)2623 × 15 (20)3225 ×56 (21)

5 7535÷??? ?? +(22) (23)87748773÷+÷ (24) 91929197÷-÷ (25) ??? ??+?652053 (26)125 9412595÷+÷ (27)38 - 38 ×47 - 38 ×37 (28)623763? (29) 31÷76+32÷7 6 (30)229 ×(15×2931 ) (31)58 ×23 ×815 (32)2534 ×4 (33)54×(89 - 5 6 ) (34)7212451871211÷??? ??++(35)38 31162375.011583÷ -?+? (36)1925214251975?+?+ (37)4818365÷??? ??+ (38) 241241343651211÷??? ??-+- (39) 115 9251197?+÷ (40) 341574357834265÷ +?+÷(41)883 883?÷? (42) ??? ??++÷??? ??++12191711259575 (43) 6 .0352444533533-÷+?+÷ (44)8×51+51×3.2 (45) 101×254

100道简便运算带答案简单例题

100道简便运算带答案简单例题1、34×3.535-3.5×34.34 =34×3.5×1.01-3.5×34×1.01 =0 2、8+89+899+8999+89999 =9+90+900+9000+90000-5 =99999-5 =99994 3、0.67×2.1+0.018×21+8.5×0.79 =0.67×2.1+0.18×2.1+8.5×0.79 =(0.67+0.18)×2.1+8.5×0.79 =0.85×2.1+0.85×7.9 =0.85×(2.1+7.9) =0.85×10 =8.5 4、22222.2×9.99999 =22222.2×(10-0.00001) =222222-0.222222 =222221.777778 5、1997×19961996-1996×19971997 =1997×1996×10001-1996×1997×10001

6、0.02+0.04+0.06+0.08+……+19.94+19.96+19.98 =(0.02+19.98)×999÷2 =10×999 =9990 7、99999×77778+33333×66666 =99999×77778+99999×22222 =99999×(77778+22222) =99999×100000 =9999900000 8、(4又5/6-3又3/4)/(3/14+2/7) =13/12÷1/2 =13/6 =2又1/6 9、(4.8/1又4/5+3又1/2+7又1/3)*4/9 =(2又2/3+7又1/3+3.5)*4/9 =(10+3.5)*4/9 =13.5*4/9 =6 10、17.2/【(3又2/5-1.25)*2/3】 =17.2/【2.15*2/3】 =17.2÷43/3

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5 7535÷??? ?? + (22) (23)87748773÷+÷ (24) 91929197÷-÷ (25) ??? ??+?652053 (26)12 5 9412595÷+÷ (27)38 - 错误!×错误! - 错误!×错误! (28)623763? (29) 31÷76+32÷7 6 (30)错误!×(15×错误!) (31)错误!×错误!×错误! (32)25错误!×4 (33)54×(错误!- \f(5,6) ) (34)7212451871211÷??? ??++(35)38 31162375.011583÷ -?+? (36)1925214251975?+?+ (37)4818365÷??? ??+ (38) 241241343651211÷??? ??-+- (39) 1159251197? +÷ (40) 341574357834265÷ +?+÷(41)883 883?÷? (42) ??? ??++÷??? ??++12191711259575

100道简便运算带答案例题

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=30+37 =67 3.2×42.3×3.75-12.5×0.423×16 =3.2×42.3×3.75-1.25×42.3×1.6 =42.3×(3.2×3.75-1.25×1.6) =42.3×(4×0.8×3.75-1.25×4×0.4) =42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×(4x0.4x7.5-1.25x4x0.4) =42.3×[4×0.4×(7.5-1.25)] =42.3×[4×0.4×6.25] =42.3×(4×2.5) =423 5、1.8+18÷1.5-0.5×0.3 =1.8+12-0.15 =13.8-0.15 =13.65 6、6.5×8+3.5×8-47 =52+28-47 =80-47 =33 (80-9.8)×5分之2-1.32 =70.2X2/5-1.32 =28.08-1.32 =26.76 7、8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25] =8×4/7÷4

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??? ??+÷51211015 7535÷??? ?? + (16)345 ×25 (17) 36×3435 (18) ( 56 - 59 )×18 5 (19)2623 × 15 (20)3225 ×56 (21) (22) (23) 87748773÷+÷ (24)91929197÷-÷ (25) ??? ??+?652053 (26)125 9412595÷+÷ (27)38 - 38 ×47 - 38 ×37 (28)623763? (29) 31÷76+32÷7 6 (30)229 ×(15×2931 )

(31)58 ×23 ×815 (32)2534 ×4 (33)54×(89 - 5 6 ) (34)7212451871211÷??? ??++(35)3831162375.011583÷ -?+? (36)1925214251975?+?+ (37)4818365÷??? ??+ (38) 241241343651211÷??? ??-+- (39) 115 9251197?+÷ (40) 341574357834265÷ +?+÷(41)883 883?÷? (42) ??? ??++÷??? ??++12191711259575 (43) 6 .0352444533533-÷+?+÷ (44)8×51+51×3.2 (45) 101×254 (46) 85+85×15 (47)8158 ÷8 (48) 31×76+32×76 (49)( 90+881)×891 (50)57×38+58×57 (51)815×516+527÷10 9

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25×97+25×3 76×25+25×24 (7)乘法分配律反用的变化练习: 38×29+38 75×299+75 64×199+64 35×68+68+68×64 ☆思考题:(8)其他的一些简便运算。 800÷25 6000÷125 3600÷8÷5 58×101-58 74×99 【思路导航】在除法里,被除数和除数同时乘或除以一个相同的数,商不变。 325÷25 =(325×4)÷(25×4) =1300÷100 =13 【练一练1】(1)450÷25 (2)525÷25 (3)3500÷125 (4)10000÷625 (5)49500÷900 (6) 9000÷225 【经典例题二】计算25×125×4×8 【思路导航】如果先把25与4相乘,可以得到100,同时把125与8相乘,可以得到1000; 再把100和1000相乘就可以了。运用了乘法交换律和结合律。 25×125×4×8 =(25×4)×(125×8) =100×1000 =100000 【练一练2】(1)125×15×8×4 (2)25× 24 (3)125×16 (4)75×16 (5)125×25× 32 (6)25×5×64×125

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