已知:x+y=5,xy=1,则(x-y)的平方等于多少
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已知:x+y=5,xy=1,则(x-y)的平方等于多少
已知:x+y=5,xy=1,则(x-y)的平方等于多少
已知:x+y=5,xy=1,则(x-y)的平方等于多少
(x-y)^2
=(x+y)^2-4xy
=5^2-4*1
=21
21
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