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2.. Cho f(x) = x5 - 3x4 + x2 - 5 và g(x) = 2x4 + 7x3 - x2 + 6 ; Tính (f(x) + 3g(x))+ (2g(x) –4f(x)) =? 3. P(x) = -9x3 + 5x4 + 8x2 - 15x3 - 4x2 - x4 + 15 - 7x3 Q(x) = 5x4 + 4x3 - 3x2 + 2x - 1 H(x) = -x4 + 2x3 - 3x2 + 4x – 5 a. Tính P(2); Q(1)+2P(-1)+4H(-2) b. P(x) + 2Q(x) = 2M(x) – 3H(x) thì M(x) = ? Mọi người giúp em , em đang cần gấp trong vòng 30' nữa ạ T^T
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