题目内容

【题目】计算下面各题,能用简便算法的用简便算法

(1)12.25﹣3.1+0.85﹣6.17

(2)(1.9﹣1.9×0.9)÷(3.8﹣2.8)

(3)2.65×1.7+1.35×1.7

(4)0.125×13.8×32×0.25

【答案】(1)3.83;

(2)0.19;

(3)6.8;

(4)13.8

【解析】

(1)12.25﹣3.1+0.85﹣6.17

=12.25+0.85﹣3.1﹣6.17

=13.1﹣3.1﹣6.17

=10﹣6.17

=3.83;

(2)(1.9﹣1.9×0.9)÷(3.8﹣2.8)

=(1.9﹣1.71)÷(3.8﹣2.8)

=0.19÷1

=0.19;

(3)2.65×1.7+1.35×1.7

=(2.65+1.35)×1.7

=4×1.7

=6.8;

(4)0.125×13.8×32×0.25

=0.125×8×(4×0.25)×13.8

=1×1×13.8

=13.8.

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