x+y²=7 xy²=12
x+12/x=7
x²-7x+12=0
（x-3）（x-4）=0
解得x=4,y²=3；或者x=3,y²=4
x=4,y=±√3；或者x=3,y=±2
所以xy=±4√3或者±6
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