问几道初中代数题,1.下列各式对不对,如果不对,应该怎样改正?(1) (a^2-2ab+b^2)÷(b-a)=a-b(2) (x^2+2xy+y^2)÷(x+y)^3=x+y2.计算(xy-x^2)÷(x-y / xy)3.分解因式,9(x+y)^2+4(x-y)^2
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![问几道初中代数题,1.下列各式对不对,如果不对,应该怎样改正?(1) (a^2-2ab+b^2)÷(b-a)=a-b(2) (x^2+2xy+y^2)÷(x+y)^3=x+y2.计算(xy-x^2)÷(x-y / xy)3.分解因式,9(x+y)^2+4(x-y)^2](/uploads/image/z/7181199-63-9.jpg?t=%E9%97%AE%E5%87%A0%E9%81%93%E5%88%9D%E4%B8%AD%E4%BB%A3%E6%95%B0%E9%A2%98%2C1.%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E5%AF%B9%E4%B8%8D%E5%AF%B9%2C%E5%A6%82%E6%9E%9C%E4%B8%8D%E5%AF%B9%2C%E5%BA%94%E8%AF%A5%E6%80%8E%E6%A0%B7%E6%94%B9%E6%AD%A3%3F%281%29+%28a%5E2-2ab%2Bb%5E2%29%C3%B7%28b-a%29%3Da-b%282%29+%28x%5E2%2B2xy%2By%5E2%29%C3%B7%28x%2By%29%5E3%3Dx%2By2.%E8%AE%A1%E7%AE%97%28xy-x%5E2%29%C3%B7%28x-y+%2F+xy%293.%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%2C9%28x%2By%29%5E2%2B4%28x-y%29%5E2)
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