鲨鱼重3吨，大象比鲨鱼重3吨，鲸鱼比大象重54吨，鲸鱼比鲨鱼重多少吨？'O(d.O8K,J:C7N7A6Q+}
算式：提示:L;K(O8c-G:l/O'O(d.O8K,J:C7N7A6Q+}
口答：鲸鱼比鲨鱼重5w0Z9d7Y;K8m:M7R,n吨。'O(d.O8K,J:C7N7A6Q+}