计算下面各题
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| (1)32×125 =4×8×125 =4×(8×125) =4×1000 =4000 (2)15×(41-17)÷30 =15×24÷30 =360÷30 =12 (3)57×101-57 =57×(101-1) =57×100 =5700 (4)42×29+42×71 =42×(29+71) =42×100 =4200 (5)618-80÷2×5 =618-40×5 =618-200 =418 (6)420÷[(205-198)×4] =420÷[7×4] =420÷28 =15 |
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