1.-1/20 2.-31/20 3.-23/60 4.1/122.-2或2
-1/20 -31/20 -23/60 -283/60正负2
一（1)-1/20 (2)-31/20 (3)-23/60 (4)-281/60二-8
大使馆
晕……1. -31/20 -23/60 1/122. 2或-2
1.-1/20 2.-31/20 3.-23/60 4.1/12 2.-2或2
