-3a^2b-[a^2b-2(2a^2b+ab-1)]
=-3a^2b-(a^2b-4a^2b-2ab+2)
=-3a^2b-(-3a^2b-2ab+2)
=-3a^2b+3a^2b+2ab+2
=2ab+2
a,b互为倒数,ab=1
所以:2ab+2=2*1+2=4
另外发并点击我的头像向我求助,请谅解,
,你的采纳是我服务的动力.
-3a^2b-[a^2b-2(2a^2b+ab-1)]
=-3a^2b-(a^2b-4a^2b-2ab+2)
=-3a^2b-(-3a^2b-2ab+2)
=-3a^2b+3a^2b+2ab+2
=2ab+2
a,b互为倒数,ab=1
所以:2ab+2=2*1+2=4
另外发并点击我的头像向我求助,请谅解,
,你的采纳是我服务的动力.