解方程(7x+70)/(3x+70)=7/4(7x+70)/(3x+70)=7/4

问题描述:

解方程(7x+70)/(3x+70)=7/4
(7x+70)/(3x+70)=7/4

(7x+70)/(3x+70)=7/4
(7x+70)*4=(3x+70)*7
28x+280=21x+490
7x=210
x=30

(7x+70)/(3x+70)=7/4
4*(7x+70)=(3x+70)*7
28x+280=21x+490
7x=210
x=30