【題目】能簡便計算的要簡算
(1)(12.5﹣1.25)×8
(2)5.7×18.34﹣57×0.834
(3)38.7×0.412+5.88×3.87
(4)5.64+99×5.64
(5)20.1×35.22﹣3.522
(6)20.9﹣0.9×2.5.
【答案】90,57,38.7,564,704.4,18.65
【解析】試題分析:(1)(4)根據(jù)乘法分配律進行簡算;
(2)(3)(5)通過數(shù)字轉(zhuǎn)化,運用乘法分配律簡算;
(6)先算乘法,再算減法.
解答:解:(1)(12.5﹣1.25)×8
=8×12.5﹣8×1.25
=100﹣10
=90
(2)5.7×18.34﹣57×0.834
=57×(1.834﹣0.834)
=57×1
=57
(3)38.7×0.412+5.88×3.87
=38.7×(0.412+0.588)
=38.7×1
=38.7
(4)5.64+99×5.64
=(99+1)×5.64
=100×5.64
=564
(5)20.1×35.22﹣3.522
=201×3.522﹣3.522
=(201﹣1)×3.522
=200×3.522
=704.4
(6)20.9﹣0.9×2.5
=20.9﹣2.25
=18.65
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