已知A=3x³-2x²-5,B=5x³-3x²+8-1 (1)求3A-2B (2)求B-2A
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![已知A=3x³-2x²-5,B=5x³-3x²+8-1 (1)求3A-2B (2)求B-2A](/uploads/image/z/469486-46-6.jpg?t=%E5%B7%B2%E7%9F%A5A%3D3x%26%23179%3B-2x%26%23178%3B-5%2CB%3D5x%26%23179%3B-3x%26%23178%3B%2B8-1+%EF%BC%881%EF%BC%89%E6%B1%823A-2B+%EF%BC%882%EF%BC%89%E6%B1%82B-2A)
已知A=3x³-2x²-5,B=5x³-3x²+8-1 (1)求3A-2B (2)求B-2A
已知A=3x³-2x²-5,B=5x³-3x²+8-1 (1)求3A-2B (2)求B-2A
已知A=3x³-2x²-5,B=5x³-3x²+8-1 (1)求3A-2B (2)求B-2A
B=5x³-3x²+8-1
3A=3(3x³-2x²-5)
2B=2(5x³-3x^2+7)
3A-2B=9x^3-6x^2-15-10x^3+6x^2-14=-x^3-29
B-2A=5X^3-3X^2+8-1-2(3X^3-2X^2-5)=-X^3+X^2+12