已知A=3a²-2b²,B=a²+6b².若A=5,B=15,求a²-a²b²+4b²
人气:493 ℃ 时间:2019-11-19 08:59:31
解答
若A=5,B=15,则
3a²-2b²=5.(1)
a²+6b²=15.(2)
(1)*3+(2):
a^2=3
则b^2=2
a²-a²b²+4b²
=3-3*2+4*2
=5
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