简便方法计算. 31/2÷4+360×25%+0.25×36.5; (7.25×40%+2.75×2/5)÷20%; [1.9+19%×(4.8-34/5)]÷(29/10-190%)
问题描述:
简便方法计算.
3
÷4+360×25%+0.25×36.5;1 2
(7.25×40%+2.75×
)÷20%;2 5
[1.9+19%×(4.8-3
)]÷(24 5
-190%) 9 10
答
(1)312÷4+360×25%+0.25×36.5=3.5×14+360×0.25+0.25×36.5=3.5×0.25+360×0.25+0.25×36.5=(3.5+36.5+360)×0.25=400×0.25=100;(2)(7.25×40%+2.75×25)÷20%=(7.25×40%+2.75×40%)÷20%=(7.25+2...