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

您好：

1、 3又2分之1÷4﹢360×25％﹢0.25×36.5
=3.5x0.25+360x0.25+36.5x0.25
=(3.5+360+36.5)x0.24
=400x0.25
=100

2、﹙7.25×40％﹢2.75×5分之2﹚÷20％
=(7.25x0.4+2.75x0.4)x5
=(7.25+2.75)x0.4x5
=10x2
=20

3、 [1.9+19％×﹙4.8－3又5分之4﹚]÷﹙2又10分之9－190％﹚
=[1.9+0.19x(4.8-3.8)]÷（2.9-1.9）
=（1.9+0.19x1）÷1
=1.9+0.19
=2.09

如有不明白，可以追问如有帮助，记得采纳。
谢谢 祝学习进步！

1.原式=3.5×0.25+360×0.25+36.5×0.25
=（3.5+360+36.5）×0.25
=400×0.25
=100
2.原式=(7.25×0.4+2.75×0.4）÷0.2
=[﹙7.25+2.75﹚×0.4]×5
=4×5
=20
3.原式=[1.9+0.19×1]÷1
=2.09÷1
=2.09