(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-1)

(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-1)