3a²+2ab=5,3b²+2ab=2,a²-b²=

问题描述:

3a²+2ab=5,3b²+2ab=2,a²-b²=

1

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