(3x+2y)(2x+3y)-(4x-3y)(3x+4y) 等于多少?
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(3x+2y)(2x+3y)-(4x-3y)(3x+4y) 等于多少?
(3x+2y)(2x+3y)-(4x-3y)(3x+4y) 等于多少?
(3x+2y)(2x+3y)-(4x-3y)(3x+4y) 等于多少?
=6x^2+4xy+9xy+6y^2-12x^2+9xy-16xy+12y^2
=-6x^2+6xy+18y^2
=6(-x^2+xy+3y^2)
-6x^2+6xy+18y^2
6x^2+9xy+4xy+6y^2-(12x^2+16xy-9xy-12y^2)
6x^2+13xy+6y^2-12x^2-7xy+12y^2
-6x^2+6xy+18y^2
望采纳
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