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4x+3y-8z
7x-8y+5z
=
11x-5y-3z
2.- (4x3+5x-7x2+9) + (6x3-4x+3x2-3)
4x3-7x2-5x+9
6x3+3x2-4x-3
=
10x3-4x2+x+6
En este ultimo x3 es x al cubo, y x2 es x al cuadrado.
Espero y te sean de utilidad