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(2x-y)的2次方-4(x-y)(x+2y)=?
人气:128 ℃ 时间:2019-08-18 12:48:33
解答
(2x-y)的2次方-4(x-y)(x+2y)
= 4x^2-4xy+y^2 - 4(x^2+xy-2y^2)
= 4x^2-4xy+y^2 - 4x^2-4xy+8y^2
= -8xy+9y^2
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