计算:3x-2y- [-4x+(z+3y)]

问题描述:

计算:3x-2y- [-4x+(z+3y)]

什么叫—4x
是不是这样
3x-2y+4x-z-3y
=3x+4x-2y-3y-z
=7x-5y-z
对吗?

3x-2y- [-4x+(z+3y)]
=3x-2y+4x-(z+3y)
=3x-2y+4x-z-3y
=7x-5y-z

3x-2y- [-4x+(z+3y)]
=3x-2y- (-4x+z+3y)
=3x-2y+4x-z-3y
=7x-5y-z