题目内容

【题目】能简便计算的要简算

(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】试题分析:(1)(4)根据乘法分配律进行简算;

(2)(3)(5)通过数字转化,运用乘法分配律简算;

(6)先算乘法,再算减法.

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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