题目内容
【题目】
用你喜欢的方法计算: 39× | [﹣(+)]÷ | 36×(++) |
(3﹣1.4)÷ | 1×﹣× | ÷÷. |
【答案】(1)39×,
=(38+1)×,
=38×+1×,
=35+,
=35;
(2)[﹣(+)]÷,
=[﹣]÷,
=÷,
=;
(3)36×(++),
=36×+36×+36×,
=16+30+10,
=46+10,
=56;
(4)(3﹣1.4)÷,
=1.6÷,
=6;
(5)1×﹣×,
=(1﹣)×,
=1×,
=;
(6)÷÷,
=××,
=×(×),
=×1,
=.
【解析】解:(1)39×,
=(38+1)×,
=38×+1×,
=35+,
=35;
(2)[﹣(+)]÷,
=[﹣]÷,
=÷,
=;
(3)36×(++),
=36×+36×+36×,
=16+30+10,
=46+10,
=56;
(4)(3﹣1.4)÷,
=1.6÷,
=6;
(5)1×﹣×,
=(1﹣)×,
=1×,
=;
(6)÷÷,
=××,
=×(×),
=×1,
=.
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