多项式x²-3x+2,x²-18x+32,x²+x-6的公因式是()若(x+5),(x-3)都是二次三项式x²-kx-15的因式,那么K的值为()a的三次方(x-y)-3a²b(y-x)因式分解为()若½a²b+M=½ab(N+

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