题目内容
【题目】(葫芦岛)脱式计算,能简算的要简算.
(1)0.125+3.7×+×5.3
(2)(4.6÷5+0.4×0.2)×2.8
(3)
(4).
【答案】(1)1.25(2)2.8(3)(4)1
【解析】
试题分析:(1)可根据乘法分配律计算;
(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)可根据乘法分配律及加法结合律计算.
解答:解:(1)0.125+3.7×+×5.3
=0.125+3.7×0.125+0.125×5.3,
=0.125×(1+3.7+5.3),
=0.125×10,
=1.25;
(2)(4.6÷5+0.4×0.2)×2.8
=(0.92+0.08)×2.8,
=1×2.8,
=2.8;
(3)×[÷(﹣)]
=×[÷],
=×,
=;
(4)
=×+×+,
=+(+),
=+1,
=1.
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