作业帮已知xy=¼,则(x+y)²-(x-y)²的值为
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/13 20:07:37
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
(x+y)²-(x-y)²
=x²+2xy+y²-(x²+y²-2xy)
=4xy
=4×(1/4)
=1
(x+y)²-(x-y)²
=x²+2xy+y²-x²-y²+2xy
=4xy
=4×(1/4)
=1
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来源：学生作业帮助网 编辑：作业帮 时间：2024/05/13 20:07:37
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
已知xy=¼,则(x+y)²-(x-y)²的值为
(x+y)²-(x-y)²
=x²+2xy+y²-(x²+y²-2xy)
=4xy
=4×(1/4)
=1
(x+y)²-(x-y)²
=x²+2xy+y²-x²-y²+2xy
=4xy
=4×(1/4)
=1