[填空题]
A square uniform raft, 18 m by 18 m, of mass 6800 kg, istr (3wafg:. ct ef7j/l0k o,dy used asrri fvgty-65 he :6l yb7+tqz: a ferryboat. If three cars, each of mass 1200 kg, occupy its NE, SE, and SW corners, q:rv:yt6i5eg r7-lhzt+6 bfydetermine the CM of the loaded ferryboat.$X_{CM}$ = m $Y_{CM}$ = m