﹙x-y﹚a-x+y 用分组分解法因式分解

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﹙x-y﹚a-x+y 用分组分解法因式分解
﹙x-y﹚a-x+y 用分组分解法因式分解

﹙x-y﹚a-x+y 用分组分解法因式分解
﹙x-y﹚a-x+y
=(x-y)a-(x-y)
=(x-y)(a-1)

原式=(x-y)a-(x-y)=(x-y)(a-1)

原式=(x-y)a-(x-y) =(x-y)(a-1)

XA-YA-X+Y
x(a-1)+y(a-1)=(x+y)(a-1)

(x-y)a-x+y
=(x-y)a-(x-y)
=(x-y)(a-1)