数学求平均值公式

简介：At Cheng Keshu's home, after finishing her exercises, she stretched out slightly, her jet-black hair tangled around his chest, with a hint of dreamy beauty, she turned around and turned off the lamp, standing by the window, her amber His eyes were staring at the bright night sky outside the window in a daze. What does the future look like? Xiao Keshu, who is sixteen or seventeen years old, is a little worried about gains and losses.