由方程组解得:a+b=-5
2a-b=-1
3a=-6 => a=-2 => b=-5-(-2)=-3
a=-2 b=-3
代入代数式 ab(a+b²)-b²(ab-a)+2a(a-b²)
=(-2)(-3)[(-2)+(-3)²]-(-3)²[(-2)(-3)-(-2)]+2(-2)[(-2)-(-3)²]
=6(-2+9)-9(6+2)-4(-2-9)
=6*7-9*8-4(-11)
=42-72+44
=14