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(7x2+2y2)2-(2x2+7y2)2 因式分解.
人气:227 ℃ 时间:2020-10-02 01:32:36
解答
(7x2+2y2)2-(2x2+7y2)2
=(7x²+2y²+2x²+7y²)(7x²+2y²-2x²-7y²)
=(9x²+9y²)(5x²-5y²)
=45(x²+y²)(x-y)(x+y)
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