简便方法计算.3 1 2 ÷4+360×25%+0.25×36.5;(7.25×40%+2.75× 2 5 )÷20%

简便方法计算.3 1 2 ÷4+360×25%+0.25×36.5;(7.25×40%+2.75× 2 5 )÷20%;[1.9+19%×(4.8-3 4 5 )]÷(2 9 10 -190%)

(1)3
1
2
÷4+360×25%+0.25×36.5
=3.5×
1
4
+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×
2
5
)÷20%
=(7.25×40%+2.75×40%)÷20%
=(7.25+2.75)×40%÷20%
=10×40%÷20%
=4÷20%
=20;

(3)[1.9+19%×(4.8-3
4
5
)]÷(2
9
10
-190%)
=[1.9+0.19×(4.8-3.8)]÷(2.9-1.9)
=(1.9+0.19×1)÷1
=(1.9+0.19)÷1
=2.09÷1
=2.09.
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