Question

a-) (2x+3y-4z+8)+(×-y+2z-2) b-) (7xy+4x+8z-1,5)-(6x+10y-3)

Answer 1

a- 2x+3y-4z+8+x-y+2z-2
2x+x+3y-y-4z+2z+8-2
3x+2y-2z+6

b- 7xy+4x+8z-1,5-6x-10y+3
7xy+4x-6x+8z-1,5+3-10y
7xy-2x+8z+1,5-10y