a+2=0,a+b+5=0a=-2,b=-33a²b-[2a²b-（3ab-a²b）-4a²]-2ab=3a^2b-2a^2b+3ab-a^2b+4a^2-2ab=4a^2+ab=4*(-2)^2+(-2)*(-3)=16+6=22
