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已知x2+xy=5,xy+y2=-1,则x2-y2=______.
人气:369 ℃ 时间:2019-11-18 03:00:36
解答
∵x2+xy=5,xy+y2=-1,
∴(x2+xy)-(xy+y2
=x2+xy-xy-y2
=x2-y2
=5-(-1)
=6.
故填:6
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