如果a²+ab=5,b²+3ab=9,则a²-2ab-b²=?
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如果a²+ab=5,b²+3ab=9,则a²-2ab-b²=?
如果a²+ab=5,b²+3ab=9,则a²-2ab-b²=?
如果a²+ab=5,b²+3ab=9,则a²-2ab-b²=?
a²-2ab-b²
=(a²+ab)-(b²+3ab)
=5-9
=-4