2x=90-x 解方程
问题描述:
2x=90-x 解方程
答
2x=90-x (移项)
2x+x=90
3x=90
x=90/3
x=30
答
2x=90-x 解方程
2x+x=90
3x=90
x=30
答
2x=90-x
2x + x = 90
3x = 90
x = 90/3 =30