题目内容

【题目】计算下面各题,能简算的要简算.

4.05÷[1.8×(3.36﹣2.86)]

19.75﹣6.45﹣3.55

5.3×0.82﹣0.82×0.3

【答案】4.5;9.75;4.1

【解析】

(1)4.05÷[1.8×(3.36﹣2.86)]

=4.05÷[1.8×0.5]

=4.05÷0.9

=4.5;

(2)19.75﹣6.45﹣3.55

=19.75﹣(6.45+3.55)

=19.75﹣10

=9.75

(3)5.3×0.82﹣0.82×0.3

=(5.3﹣0.3)×0.82

=5×0.82

=4.1

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