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(x^2+y^2)-x^2y^2=?
人气:318 ℃ 时间:2020-02-04 12:55:38
解答
(x²+y²)-x²y²
=x²+y²+2x²y²-3x²y²
=(x+y)²-3x²y²
=(x+y+√3xy)(x+y-√3xy)
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