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=(3x³-2x²-x-5y)+(x²-2x+4)
= 3x³+(-2x²+x²)+(-x-2x)+(-5y)+4
=3x³-x²-3x-5y+4
b) P(x)-Q(x)
=(3x³-2x²-x-5y)-(x²-2x+4)
= 3x³-2x²-x-5y-x²+2x-4
=3x³-3x²+x-5y-4
Espero haberte ayudado!!!