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用简便方法计算.25×1.25×32(3.75+4.1+2.35)×9.8.
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用简便方法计算. 25×1.25×32 (3.75+4.1+2.35)×9.8. |
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答案和解析
(1)25×1.25×32 =25×1.25×4×8, =(25×4)×(1.25×8), =100×10, =1000; (2)(3.75+4.1+2.35)×9.8 =(3.75+2.35+4.1)×9.8, =(6.1+4.1)×9.8, =10.2×9.8, =10.2×(10-0.2), =10.2×10-10.2×0.2, =102-2.04, =99.96. |
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