数学求平均值公式

简介：As the governor of the three sides, and also an important minister among the important ministers in the eyes of Emperor Longwu, Sun Chuanting was one of the first batch of governors to get the four-wheeled carriage. When they first met, he was very surprised. As a good commander, the first thing he thought of was how Is this kind of carriage that is flexible in turning and can carry more food and grass used in the army?