解方程(5a-1)/8=7/4 (x-1)/4-1=(2x+1)/6

问题描述:

解方程(5a-1)/8=7/4 (x-1)/4-1=(2x+1)/6

(5a-1)\8=7\4
5a-1=14
5a=15
a=3

a=3 x无解

(5a-1)/8=7/4
5a-1=14
5a=15
a=3
(x-1)/4-1=(2x+1)/6
3x-3-12=4x+2
4x-3x=-15-2
x=-17

(5a-1)/8=7/4
两边乘以8得
5a-1=14
5a=15
∴a=3

(x-1)/4-1=(2x+1)/6
两边乘以12得
3(x-1)-12=2(2x+1)
3x-3-12=4x+2
-x=-17
∴x=17