Me ajudemmmmm pfvrrr
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Explicação passo-a-passo:
P - Q
21x³ + 18xy - 10y - ( -5x³ +13xy - 11y)=
21x³ + 18xy - 10y + 5x³ - 13xy + 11y=
21x³ +5x³ +18xy - 13xy - 10y + 11y =
26x³ +5xy - y