x+y=4,xy=2则(x-y)²=﹙ ﹚
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/23 17:41:13
![x+y=4,xy=2则(x-y)²=﹙ ﹚](/uploads/image/z/6794923-67-3.jpg?t=x%2By%3D4%2Cxy%3D2%E5%88%99%EF%BC%88x-y%EF%BC%89%26%23178%3B%EF%BC%9D%EF%B9%99+%EF%B9%9A)
x+y=4,xy=2则(x-y)²=﹙ ﹚
x+y=4,xy=2则(x-y)²=﹙ ﹚
x+y=4,xy=2则(x-y)²=﹙ ﹚
(x-y)²
=x^2-2xy+y^2
=x^2+2xy+y^2-4xy
=(x+y)^2-4xy
=8
(x-y)²
=(x+y)² - 4xy
=16 - 8
=8
x+y=4,xy=2则(x-y)²=8
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/23 17:41:13
x+y=4,xy=2则(x-y)²=﹙ ﹚
x+y=4,xy=2则(x-y)²=﹙ ﹚
x+y=4,xy=2则(x-y)²=﹙ ﹚
(x-y)²
=x^2-2xy+y^2
=x^2+2xy+y^2-4xy
=(x+y)^2-4xy
=8
(x-y)²
=(x+y)² - 4xy
=16 - 8
=8
x+y=4,xy=2则(x-y)²=8