数学求平均值公式

简介：Surprisingly, the three Han army flags, plus half of Ma Guangyuan's artillery battalion and the Mongolian cavalry supervising the battle, with nearly 20,000 troops, did not capture Yutian, a small town. It seems that Yutian is a hard nut to crack. ; What refreshed him was that Prince Yu made a decisive decision and made a choice instead of staying in the poor mountains and rivers, hesitating.