4x-7x=9-5x x=?
问题描述:
4x-7x=9-5x x=?
答
4x-7x=9-5x
4x-7x+5x=9
2x=9
x=2分之9
4x-7x=9-5x x=?
4x-7x=9-5x
4x-7x+5x=9
2x=9
x=2分之9