计算:(3-11)-(5-9)
-I-11/3I-(+2/3)-I-3/5I+(-2/5)
原式=-8+4-11/3-2/3-3/5-2/5=-5-13/3=-28/3
1:-8-(-4)=4-8=-4
-8-(-4)-11/3-2/3-3/5-2/5
-4-13/3-1
-5-13/3
-28/3