已知A=x³-5x²,B=x²-11x+6,求:⒈A+2B;⒉当x=-1时,求A+5B
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![已知A=x³-5x²,B=x²-11x+6,求:⒈A+2B;⒉当x=-1时,求A+5B](/uploads/image/z/2743487-71-7.jpg?t=%E5%B7%B2%E7%9F%A5A%3Dx%26%23179%3B-5x%26%23178%3B%2CB%3Dx%26%23178%3B-11x%2B6%2C%E6%B1%82%EF%BC%9A%E2%92%88A%2B2B%3B%E2%92%89%E5%BD%93x%3D-1%E6%97%B6%2C%E6%B1%82A%2B5B)
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已知A=x³-5x²,B=x²-11x+6,求:⒈A+2B;⒉当x=-1时,求A+5B
已知A=x³-5x²,B=x²-11x+6,求:⒈A+2B;⒉当x=-1时,求A+5B
已知A=x³-5x²,B=x²-11x+6,求:⒈A+2B;⒉当x=-1时,求A+5B
(1)原式=x3-5x2+2(x2-11x+6)
=x3-3x2-22x+12;
(2)A+5B=x3-5x2+5(x2-11x+6)
=x3-55x+30;
当x=-1时,
原式=-1+55+30=84.