[1又5分之3×(1-8分之3)】2次方÷【(1-6分之1)×(-5分之2)】的2次方=(8/5×5/8)^2÷[5/6×(-2/5)]^2=1×9=9(3a的3次方+2a-a的2次方)+1-(4a的3次方+2a的2次方-3a+1)=(3a^3+2a-a^2)+1-(4a^3+2a^2-3a+1)=3a^3+2a-a^2+1-4a^3-2a^2+3a-1=-a^3+5a-3a^2把a=-1代入方程=1-5-3=-7
答案9