(5x-7y)^2-(7x+5y)^2 因式分解
问题描述:
(5x-7y)^2-(7x+5y)^2 因式分解
(5x-7y)^2-(7x+5y)^2
答
(5x-7y)^2-(7x+5y)^2
=(5x-7y+7x+5y)(5x-7y-7x-5y)
=(12x-2y)(-2x-12y)
=-4(6x-y)(x+6y)
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