因式分解 (25 19:22:21)a2-4a+4-b2               2/1x2-xy+2/1y2                   (x2-6x

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因式分解(2519:22:21)a2-4a+4-b2            &#

因式分解 (25 19:22:21)a2-4a+4-b2               2/1x2-xy+2/1y2                   (x2-6x
因式分解 (25 19:22:21)
a2-4a+4-b2               2/1x2-xy+2/1y2                   (x2-6x)2+17(x2-6x)+72

因式分解 (25 19:22:21)a2-4a+4-b2               2/1x2-xy+2/1y2                   (x2-6x
a2-4a+4-b2 =(a-2)²-b² =(a+b-2)(a-b-2) 2/1x2-xy+2/1y2 =2/1*(x²-2xy+y²) =2/1*(x-y)² (x2-6x)2+17(x2-6x)+72 =(x²-6x+8)(x²-6x+9) =(x-2)(x-4)(x-3)²