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