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(3x+6+2y)²
人气:123 ℃ 时间:2020-04-06 11:09:45
解答
=[3(x+2)+2y]^2
=9(x+2)^2+12(x+2)y+4y^2
=9x^2+36x+36+12xy+24y+4y^2
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