(2x+y)(2x-y)-(2x-1)的平方 最后等于多少/办妥
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(2x+y)(2x-y)-(2x-1)的平方 最后等于多少/办妥
(2x+y)(2x-y)-(2x-1)的平方 最后等于多少/
办妥
(2x+y)(2x-y)-(2x-1)的平方 最后等于多少/办妥
=4x^2-y^2-(4x^2+1-4x)
=4x^2-y^2-4x^2-1+4x
=4x-y^2-1
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