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Bài 6: Cho hai đa thức a) P(x) = x³-2x+3x²-x+2; Q(x) = x+ -2x³+x-5 b) P(x)=x+3x-x²-4; c) P(x)=-7x² + 8x - 9; Q(x) = x - x² - 3x3 + x Q(x) = x²-2x+5 d) P(x)=x+2x3x² +5x-2; Q(x) = x² + x²-2x³ +2 Tính P(x)+Qz);Pz)-Q(2)