(2-3)-(5*7-8)+11-(9-6-4)*(3+1)=(1/2-3)*(1-1/2-1/
3)*(-1-1/2)*(-4)*(-2-1/3)-(-4)*(-1/8)*(2-1-1/3)*(2-1-1/3)*(2+1/3-1/2)=
有负数和绝对值
感激不尽