(1)若(x+3)(x+m)=x的平方+kx-15则k+m的值为( ) A -3 B 5 C -2 D 2(2)已知A=(2x+1)(x-1)-x(1-3y),B=-x的平方+xy-1,且3A+6B的值与x无关,求y的值.3、观察下列等式(x-1)(x+1)=x的平方-1;(x-1)(x的
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![(1)若(x+3)(x+m)=x的平方+kx-15则k+m的值为( ) A -3 B 5 C -2 D 2(2)已知A=(2x+1)(x-1)-x(1-3y),B=-x的平方+xy-1,且3A+6B的值与x无关,求y的值.3、观察下列等式(x-1)(x+1)=x的平方-1;(x-1)(x的](/uploads/image/z/2000484-36-4.jpg?t=%EF%BC%881%EF%BC%89%E8%8B%A5%EF%BC%88x%2B3%EF%BC%89%EF%BC%88x%2Bm%EF%BC%89%3Dx%E7%9A%84%E5%B9%B3%E6%96%B9%2Bkx-15%E5%88%99k%2Bm%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89+A+-3+B+5+C+-2+D+2%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5A%3D%EF%BC%882x%2B1%29%28x-1%29-x%281-3y%29%2CB%3D-x%E7%9A%84%E5%B9%B3%E6%96%B9%2Bxy-1%2C%E4%B8%943A%2B6B%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%2C%E6%B1%82y%E7%9A%84%E5%80%BC.3%E3%80%81%E8%A7%82%E5%AF%9F%E4%B8%8B%E5%88%97%E7%AD%89%E5%BC%8F%EF%BC%88x-1%EF%BC%89%EF%BC%88x%2B1%EF%BC%89%3Dx%E7%9A%84%E5%B9%B3%E6%96%B9-1%EF%BC%9B%EF%BC%88x-1%EF%BC%89%EF%BC%88x%E7%9A%84)
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