1 小数四则运算的运算技巧
五上数学培优(一)
小数四则混合运算的计算技巧
例1:计算52.8—7.3+6.4+7.2—6.7+5.6
1.1.2+4.3+3.8+6.7
2. 199.4+234.5+
3.6+42.5 3.18.7+62.5+9.34+6.66+7.5+3.3
例2: 7.48×45+74.8×5.5 1.1.9×365—9×36.5 2. 9.8×1280+98×42+980×3.5+0.98×9500 3.3.14×4300+31.4×356-314×42.7-3140×0.59
例3:0.125×0.25×0.5×256
1.40.816×1
2.5 2.(12.5×2.5×
3.2)÷(50×1.6×2.5)3.2.5×
4.5×18×6×2
例4: 5.6×16.5÷0.7÷1.1
1.1
2.6×7.6×2.32÷1.9÷1.4÷2.9
2.9×8×21×15×4÷3÷7÷3÷60×5÷25×75
3.3.56×
4.32×1.28÷0.178÷0.64÷2.16 例5: 0.9999×0.6+0.1111×3.6 1.99.99×0.8+11.11×1.8 2. 9.999×7778+3.333×6666 3.0.9999×1222—0.3333×666
练一练:
1.6.93+
2.83+5.34+
3.07+3.82+9.66+3.17
2.4650×0.63+5.35×630
3.0.5×0.8×0.04×1.25×0.2×0.025
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