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:2024/07/06 20:10:14
![已知xy=¼,则(x+y)²-(x-y)²的值为](/uploads/image/z/2738171-11-1.jpg?t=%E5%B7%B2%E7%9F%A5xy%3D%26%23188%3B%2C%E5%88%99%28x%2By%29%26%23178%3B-%28x-y%29%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA)
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:2024/07/06 20:10:14
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