桶油连桶重55.1千克，用去一半后连桶重30.1千克，这桶油重多少千克？桶重多少千克？.m2e9I6B:i9l5l6f,d(n4@6f
算式：提示-C/R0~;^*O(B8W8u4v-s.X7o'V1I(f5R8M5_;r.m2e9I6B:i9l5l6f,d(n4@6f
答：这桶油重8b9{)u千克，桶重9J)U,r(^4X9S6E2v2N/h:{4U4T千克。.m2e9I6B:i9l5l6f,d(n4@6f