mim ajuda

Escreva os polinômios na forma reduzida
a) 8x²-6x+1+7x-6x²-3-3x-x²-5

b) 6x-5y+3xy+2xy-5x+9y+4x-xy-y

c)5y+4y³-1+2y²-y³-y+7y²-1

d) 5a+3b-[5a-(a-4b)-b]

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