因（a+2）²+︳a+b+5︳=0
所以a+2=0,a+b+5=o
所以a=-2,b=-3
3a²b-【2a²b-(2ab-a²b）-4a²】-ab
=3a²b-【2a²b-2ab+a²b-4a²】-ab
=3a²b-2a²b+2ab-a²b+4a²-ab
=ab+4a²
=(-2)*（-3）+4（-2）²=6+16=22