(3x_______)^2=9x^2-12xy+4y^2
3个回答
(3x-2y)^2=9x^2-12xy+4y^2
(1/3m-2n)^2=1/9m^2+4/3mn+4n^2.
(11x±14y)^2=121x^2±308xy+196y^2
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