(1)x-25%x=21
75%X=21
X=21÷75%
X=28
(2)x+60%x=3.2
160%X=3.2
X=3.2÷160%
X=2
(3)70%X+46=60(我想你可能少打了个X)
70%X=60-46
70%X=14
X=14÷70%
X=20
(4)(1-75%)X=36
X=36÷25%
X=144
(5)3X+40%X=23.8
340%X=23.8
X=23.8÷340%
X=4
(1)x-25%x=21
75%X=21
X=21÷75%
X=28
(2)x+60%x=3.2
160%X=3.2
X=3.2÷160%
X=2
(3)70%X+46=60(我想你可能少打了个X)
70%X=60-46
70%X=14
X=14÷70%
X=20
(4)(1-75%)X=36
X=36÷25%
X=144
(5)3X+40%X=23.8
340%X=23.8
X=23.8÷340%
X=4