13688461429hh,
|a+b+2|与(2ab-1)²互为相反数,所以有:
a+b+2=0,则a+b=-2
2ab-1=0,则ab=1/2
(a+b)²/3ab-3ab/(a+b+1)
=(-2)²/(3×1/2)-(3×1/2)/(-2+1)
=4/1.5-1.5/(-1)
=8/3+3/2
=25/6
13688461429hh,
|a+b+2|与(2ab-1)²互为相反数,所以有:
a+b+2=0,则a+b=-2
2ab-1=0,则ab=1/2
(a+b)²/3ab-3ab/(a+b+1)
=(-2)²/(3×1/2)-(3×1/2)/(-2+1)
=4/1.5-1.5/(-1)
=8/3+3/2
=25/6