一元二次方程练习题含答案(解法20题题海111题)
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经典解法20题（1）(3x+1)^2=7
（2）9x^2-24x+16=11
(3) (x+3)(x-6)=-8
(4) 2x^2+3x=0
(5) 6x^2+5x-50=0 (选学）
(6)x^2-4x+4=0 （选学）
(7)（x-2）^2=4（2x+3）^2
（8）y^2+2√2y-4=0
（9）（x+1）^2-3（x+1)+2=0
（10）x^2+2ax-3a^2=0（a为常数）
(11)2x^2＋7x＝4．
(12)x^2－1＝2 x （13）x^2 + 6x+5=0
(14) x ^2－4x+ 3=0
(15)7x^2 －4x－3 =0
(16)x ^2－6x+9 =0
(17)x²+8x+16=9
(18)(x²-5)²=16
(19)x(x+2)=x(3-x)+1
(20) 6x^2+x-2=0
海量111题
1)x^2-9x+8=0
(2)x^2+6x-27=0
(3)x^2-2x-80=0
(4)x^2+10x-200=0
(5)x^2-20x+96=0
(6)x^2+23x+76=0
(7)x^2-25x+154=0
(8)x^2-12x-108=0
(9)x^2+4x-252=0
(10)x^2-11x-102=0
(11)x^2+15x-54=0
(12)x^2+11x+18=0
(13)x^2-9x+20=0
(14)x^2+19x+90=0
(15)x^2-25x+156=0
(16)x^2-22x+57=0
(17)x^2-5x-176=0
(18)x^2-26x+133=0
(19)x^2+10x-11=0
(20)x^2-3x-304=0
(21)x^2+13x-140=0
(23)x^2+5x-176=0
(24)x^2+28x+171=0
(25)x^2+14x+45=0
(26)x^2-9x-136=0
(27)x^2-15x-76=0
(28)x^2+23x+126=0
(29)x^2+9x-70=0
(30)x^2-1x-56=0
(31)x^2+7x-60=0
(32)x^2+10x-39=0
(33)x^2+19x+34=0
(34)x^2-6x-160=0
(35)x^2-6x-55=0
(36)x^2-7x-144=0
(37)x^2+20x+51=0
(38)x^2-9x+14=0
(39)x^2-29x+208=0
(40)x^2+19x-20=0
(41)x^2-13x-48=0
(42)x^2+10x+24=0
(43)x^2+28x+180=0
(45)x^2+23x+90=0
(46)x^2+7x+6=0
(47)x^2+16x+28=0
(48)x^2+5x-50=0
(49)x^2+13x-14=0
(50)x^2-23x+102=0
(51)x^2+5x-176=0
(52)x^2-8x-20=0
(53)x^2-16x+39=0
(54)x^2+32x+240=0
(55)x^2+34x+288=0
(56)x^2+22x+105=0
(57)x^2+19x-20=0
(58)x^2-7x+6=0
(59)x^2+4x-221=0
(60)x^2+6x-91=0
(61)x^2+8x+12=0
(62)x^2+7x-120=0
(63)x^2-18x+17=0
(64)x^2+7x-170=0
(65)x^2+6x+8=0
(67)x^2+24x+119=0
(68)x^2+11x-42=0
(69)x^20x-289=0
(70)x^2+13x+30=0
(71)x^2-24x+140=0
(72)x^2+4x-60=0
(73)x^2+27x+170=0
(74)x^2+27x+152=0
(75)x^2-2x-99=0
(76)x^2+12x+11=0
(77)x^2+17x+70=0
(78)x^2+20x+19=0
(79)x^2-2x-168=0
(80)x^2-13x+30=0
(81)x^2-10x-119=0
(82)x^2+16x-17=0
(83)x^2-1x-20=0
(84)x^2-2x-288=0
(85)x^2-20x+64=0
(86)x^2+22x+105=0
(87)x^2+13x+12=0
(89)x^2+26x+133=0
(90)x^2-17x+16=0
(91)x^2+3x-4=0
(92)x^2-14x+48=0
(93)x^2-12x-133=0
(94)x^2+5x+4=0
(95)x^2+6x-91=0
(96)x^2+3x-4=0
(97)x^2-13x+12=0
(98)x^2+7x-44=0
(99)x^2-6x-7=0 (100)x^2-9x-90=0 (101)x^2+17x+72=0 (102)x^2+13x-14=0 (103)x^2+9x-36=0 (104)x^2-9x-90=0 (105)x^2+14x+13=0 (106)x^2-16x+63=0 (107)x^2-15x+44=0 (108)x^2+2x-168=0 (109)x^2-6x-216=0