(a+b)(x-y)+(a+b)(x-y) 把它因式分解
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(a+b)(x-y)+(a+b)(x-y) 把它因式分解
(a+b)(x-y)+(a+b)(x-y) 把它因式分解
(a+b)(x-y)+(a+b)(x-y) 把它因式分解
(a+b)(x-y)+(a+b)(x-y)=2(a+b)(x-y)
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