x+y=4,xy=2则(x-y)²=﹙ ﹚
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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