还是没说清楚,尤其是括号部分.没法做.原式=-3.5-[7/3+1/2-(11/6-25/4)-1/2] =-3.5-[7/3-11/6+25/4] =-7/2-7/3+11/6-25/4 =-(14/4+25/4)-(14/6-11/6) =-39/4-3/6 =-39/4-1/2 =-39/4-2/4 =-41/4