1. 0.4x0.4x0.2x0.1=0.0032立方米 2. G木剩+G沙=F浮=0.4x0.2x0.1x1000x10=80 故 G木剩=21n g木剩=2.1kg g木=4.8kg g挖=2.7kg 答 挖去体积是2.7/0.6=4.5x10的负3次方