脱式计算。(能简算的要简算)(1)45÷0.75-(15+7.5×0.6)(2)5.25×8.2+5.25×0.8-5.25(3)18.45-(3.8×2.7+5.3)(4)--+-五年级数学
(1)45÷0.75-(15+7.5×0.6) = 60-(15+4.5) =60-19.5 =40.5
(3)18.45-(3.8×2.7+5.3) =18.45-(10.26+5.3) =18.45-15.56 =2.89
题目简介
脱式计算。(能简算的要简算)(1)45÷0.75-(15+7.5×0.6)(2)5.25×8.2+5.25×0.8-5.25(3)18.45-(3.8×2.7+5.3)(4)--+-五年级数学
题目详情
答案
(1)45÷0.75-(15+7.5×0.6)
= 60-(15+4.5)
=60-19.5
=40.5
=43.05+4.2-5.25
=42
(3)18.45-(3.8×2.7+5.3)
=18.45-(10.26+5.3)
=18.45-15.56
=2.89
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