某饭店买回一桶豆油，连桶称共有210千克，用去一半后，连桶称还有120千克，油桶重多少千克？1b,L:o(q*w/?*[;P2~0H7u7z*j-x3f
算式：提示0V(o-C8?(o1I'r1b,L:o(q*w/?*[;P2~0H7u7z*j-x3f
答：油桶重7u,|-m-x7X4p(W:O千克。1b,L:o(q*w/?*[;P2~0H7u7z*j-x3f