合并下列各式的同类项

问题描述:

合并下列各式的同类项
1.-(5x-y-2z)-3[4x-(x-y-z)+2y]

.-(5x-y-2z)-3[4x-(x-y-z)+2y]
=-5x+y+2z-12x+3(x-y-z)-6y
=-5x+y+2z-12x+3x-3y-3z-6y
=-14x-8y-z