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四升五年级数学 小数的简便计算
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2023-08-02
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四升五年级数学 小数的简便计算


简介：
(1)102×0.35 =100×0.35+2×0.35 =35+0.7 =35.7 (2)(8+0.8)×1.25 =8×1.25+0.8×1.25 =100+10 =110 (3)7.7×1.7+2.3×7.7 =7.7×(1.7+2.3) =7.7×4 =30.8 (4)0.28×99 =0.28×(100-1) =0.28×100-0.28×1 =28-0.28 =27.72 (5)2.98×0.25×40 =2.98×(0.25×40) =2.98×10 =29.8 (6)0.125×0.25×32 =(0.125×8)×(0.25×4) =1×1 =1 (7)9.7÷1.25÷0.8 =9.7÷(1.25×0.8) =9.7÷1 =9.7 (8)0.44×2.5 =0.11×4×2.5 =0.11×(4×2.5) =0.11×10 =1.1