多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是() A x-1 B x-16 C x+3 D x-2若(x+5),(x-3)都是二次三项式x²-kx-15的因式,则k的值是()A 8 B -8 C 2 D -2
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![多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是() A x-1 B x-16 C x+3 D x-2若(x+5),(x-3)都是二次三项式x²-kx-15的因式,则k的值是()A 8 B -8 C 2 D -2](/uploads/image/z/2555294-14-4.jpg?t=%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%26%23178%3B-3x%2B2%2Cx%26%23178%3B-18x%2B32%2Cx%26%23178%3B%2Bx-6%E7%9A%84%E5%85%AC%E5%9B%A0%E5%BC%8F%E6%98%AF%28%29+A+x-1+B+x-16+C+x%2B3+D+x-2%E8%8B%A5%28x%2B5%29%2C%28x-3%29%E9%83%BD%E6%98%AF%E4%BA%8C%E6%AC%A1%E4%B8%89%E9%A1%B9%E5%BC%8Fx%26%23178%3B-kx-15%E7%9A%84%E5%9B%A0%E5%BC%8F%2C%E5%88%99k%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88%EF%BC%89A+8+B+-8+C+2+D+-2)
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多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是() A x-1 B x-16 C x+3 D x-2若(x+5),(x-3)都是二次三项式x²-kx-15的因式,则k的值是()A 8 B -8 C 2 D -2
多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是() A x-1 B x-16 C x+3 D x-2
若(x+5),(x-3)都是二次三项式x²-kx-15的因式,则k的值是()
A 8 B -8 C 2 D -2
多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是() A x-1 B x-16 C x+3 D x-2若(x+5),(x-3)都是二次三项式x²-kx-15的因式,则k的值是()A 8 B -8 C 2 D -2
第一题:各式可变为:
x²-3x+2=(x-1)(x-2),x²-18x+32=(x-2)(x-16),x²+x-6=(x-2)(x+3)
所以选D
第二题:(x+5)乘以(x-3)=x²+2x-15=x²-(-2)x-15
所以选D
第一个=(x-2)(x-1)
第二个=(x-16)(x-2)
第三个=(x-2)(x+3)
所以选D
k=-2
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