当a=2,b=-2时,求多项式3a^3b^3-1/2a^2b+b-(4a^3b^3-1/4a^2b-b^2)+(a^3b^3+1/4a^2b)-2b^2+3的值,对吧?3a^3b^3-1/2a^2b+b-4a^3b^3+1/4a^2b+b^2+a^3b^3+1/4a^2b-2b^2+3=b-b^2+3因为这个式子的值与a无关...