作业帮(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/17 10:27:34
(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
=[(x-2y-3)+6][(x-2y-3)+4y]-(x-2y-3)(x-2y-3)
=6(x-2y-3)+4y(x-2y-3)+24y
=6x-12y-18+4xy-8y^2-12y+24y
=6x-18+4xy-8y^2
(x-2y+3)(x+2y-3)-(x-2y-3)(x-2y-3)
=[(x-2y-3)+6][(x-2y-3)+4y]-(x-2y-3)(x-2y-3)
=6(x-2y-3)+4y(x-2y-3)+24y
=6x-12y-18+4xy-8y^2-12y+24y
=6x-18+4xy-8y^2
好运
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