几道简单的代数题若多项式2(x-y)^2-7(x-y)^3-5(x-y)^2+(x-y)/7(x-y)^3+3(x-y)^2+9的值,其中x=-3,y=-2求代数式(2ax^2-x^2+3x+2)-(5x^2-3x-6bx)的值与x无关,(1)求a,b的值:(2)求2ab-3[a+2(-a+2b)-3(ab-b)]的值.已知(a-3)^2
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![几道简单的代数题若多项式2(x-y)^2-7(x-y)^3-5(x-y)^2+(x-y)/7(x-y)^3+3(x-y)^2+9的值,其中x=-3,y=-2求代数式(2ax^2-x^2+3x+2)-(5x^2-3x-6bx)的值与x无关,(1)求a,b的值:(2)求2ab-3[a+2(-a+2b)-3(ab-b)]的值.已知(a-3)^2](/uploads/image/z/7836596-44-6.jpg?t=%E5%87%A0%E9%81%93%E7%AE%80%E5%8D%95%E7%9A%84%E4%BB%A3%E6%95%B0%E9%A2%98%E8%8B%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F2%28x-y%29%5E2-7%28x-y%29%5E3-5%28x-y%29%5E2%2B%28x-y%29%2F7%28x-y%29%5E3%2B3%28x-y%29%5E2%2B9%E7%9A%84%E5%80%BC%2C%E5%85%B6%E4%B8%ADx%3D-3%2Cy%3D-2%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%282ax%5E2-x%5E2%2B3x%2B2%29-%285x%5E2-3x-6bx%29%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%2C%281%29%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC%3A%282%29%E6%B1%822ab-3%5Ba%2B2%EF%BC%88-a%2B2b%EF%BC%89-3%EF%BC%88ab-b%EF%BC%89%5D%E7%9A%84%E5%80%BC.%E5%B7%B2%E7%9F%A5%EF%BC%88a-3%EF%BC%89%5E2)
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