1箱鸡蛋重40千克，1箱鸭蛋重45千克。12箱鸡蛋和12箱鸭蛋共重多少千克？.I4M.]-u-X*w4C3S
算式：提示'k6P'_+}-s,h1W7S.I4M.]-u-X*w4C3S
答：12箱鸡蛋和12箱鸭蛋共重5N-e/E1[)d千克.I4M.]-u-X*w4C3S