Question

解方程 3/4x-25%=4 x÷1/4=2/3 95%x-20%x=4.5 xX（3/4+50%=3/20

Answer 1

1.
(3/4)x-25%=4
(3/4)x-(1/4)=4
(3x-1)/4=4
3x-1=16
3x=17
x=17/3
经检验,x=17/3是原方程的根.
2.
x÷(1/4)=2/3
4x=2/3
x=1/6
经检验,x=1/6是原方程的根.
3.
95%x-20%x=4.5
75%x=4.5
(75x/100)=45/10
(3x/4)=9/2
6x=36
x=6
经检验,x=6是原方程的根.
4.
x(3/4+50%)=3/20
x(75%+50%)=3/20
125%x=3/20
(125x/100)=3/20
(5x/4)=3/20
100x=12
x=3/25
经检验,x=3/25是原方程的根.