因式分解,坐等、急(1)a²b+ab²-a-b(2)ax²-a与x²-2x+1的公因式是(3)若m-n=2,m²-2mn+n²=(4)xy²-4x=,x²-4(x-1)=,(a+b)²-4(a+b)+4=
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![因式分解,坐等、急(1)a²b+ab²-a-b(2)ax²-a与x²-2x+1的公因式是(3)若m-n=2,m²-2mn+n²=(4)xy²-4x=,x²-4(x-1)=,(a+b)²-4(a+b)+4=](/uploads/image/z/12551234-50-4.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%2C%E5%9D%90%E7%AD%89%E3%80%81%E6%80%A5%EF%BC%881%EF%BC%89a%26%23178%3Bb%2Bab%26%23178%3B-a-b%EF%BC%882%EF%BC%89ax%26%23178%3B-a%E4%B8%8Ex%26%23178%3B-2x%2B1%E7%9A%84%E5%85%AC%E5%9B%A0%E5%BC%8F%E6%98%AF%EF%BC%883%EF%BC%89%E8%8B%A5m-n%3D2%2Cm%26%23178%3B-2mn%2Bn%26%23178%3B%3D%EF%BC%884%EF%BC%89xy%26%23178%3B-4x%3D%2Cx%26%23178%3B-4%EF%BC%88x-1%EF%BC%89%3D%2C%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-4%EF%BC%88a%2Bb%EF%BC%89%2B4%3D)
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因式分解,坐等、急(1)a²b+ab²-a-b(2)ax²-a与x²-2x+1的公因式是(3)若m-n=2,m²-2mn+n²=(4)xy²-4x=,x²-4(x-1)=,(a+b)²-4(a+b)+4=
因式分解,坐等、急
(1)a²b+ab²-a-b
(2)ax²-a与x²-2x+1的公因式是
(3)若m-n=2,m²-2mn+n²=
(4)xy²-4x=,x²-4(x-1)=,(a+b)²-4(a+b)+4=
因式分解,坐等、急(1)a²b+ab²-a-b(2)ax²-a与x²-2x+1的公因式是(3)若m-n=2,m²-2mn+n²=(4)xy²-4x=,x²-4(x-1)=,(a+b)²-4(a+b)+4=
(1)a²b+ab²-a-b
=(a²b+ab²)-(a+b)
=ab(a+b)-(a+b)
=(a+b)(ab-1)
(2)ax²-a与x²-2x+1的公因式是(x-1).
(3)若m-n=2,m²-2mn+n²=(n-n)²=2²=4
(4)xy²-4x=x(y²-4)=x(y+2)(y-2)
x²-4(x-1)=x²-4x+4=(x-2)²
(a+b)²-4(a+b)+4=[(a+b)-2]²=(a+b-2)²
1.(ab-1)×(a+b) 2. (x-1) 3. 4 4.X×(y+2)×(y-2)(x-2)的平方 (a+b-2)的平方