能用简便方法计算的用简便方法计算.25×1.25×32(3.75+4.1+2.15)×9.85400-2940÷28×27(20.2×0.4+7.88)÷4.2(45+14)÷73+71010÷[83-(513÷526+25)].-数学
题文
能用简便方法计算的用简便方法计算. 25×1.25×32 (3.75+4.1+2.15)×9.8 5400-2940÷28×27 (20.2×0.4+7.88)÷4.2 (
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答案
(1)25×1.25×32, =(25×4)×(1.25×8), =100×10, =1000; (2)(3.75+4.1+2.15)×9.8, =10×9.8, =98; (3)5400-2940÷28×27, =5400-105×27, =5400-2835, =2565; (4)(20.2×0.4+7.88)÷4.2, =(8.08+7.88)÷4.2, =15.96÷4.2, =3.8; (5)(
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