3/4x=2/3(680-x)方程怎么解

问题描述:

3/4x=2/3(680-x)方程怎么解

3/4x=2/3(680-x)
乘以12得
9x=8(680-x)
9x=8*680-8x
9x+8x=8*680
17x=8*680
x=8*680/17
x=8*40
x=320