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a) P(x)=5x^3-4x^2+5x^2+2x^3-4x^2+2
= 7x^3 - 3x^2 + 2
b) Q(x)=3x^2+4x-5+7/2x^2-6x-6x^2+10
= 14x^-2 - 3x^2 - 2x + 5
c) R(x)=7x-5x^4+4x^2+5x-2+4/7x+3x^2
= 28x^-1 - 5x^4 + 7x^2 + 12x - 2
d) S(x)=4x+1/2-4/3x+4x^3-2x+7
= -12x^-1 + 4x^3 + 2x + 15/2
Espero Haberte Ayudado.
Saludos.
Juan Soto.