和定最值解题思路简介：He looked up at the only clock under the podium in the classroom. The hands had already reached five-fifty, so he said, "It's done. You go back quickly. If you're late, you won't be able to catch the last bus."
He looked up at the only clock under the podium in the classroom. The hands had already reached five-fifty, so he said, "It's done. You go back quickly. If you're late, you won't be able to catch the last bus."
