3a²+2ab=5,3b²+2ab=2,a²-b²=

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3a²+2ab=5,3b²+2ab=2,a²-b²=
3a²+2ab=5,3b²+2ab=2,a²-b²=

3a²+2ab=5,3b²+2ab=2,a²-b²=
3a²+2ab=5,3b²+2ab=2,
两个式子相减
3a²-3b²=3
所以a²-b²=1