算术平均值公式简介：Seeing Su Can walk in after waving goodbye to Su Xiaoxiao, he lowered his head slightly, not looking at him, and calmly wrote formulas on the draft paper with a black gel pen.
Seeing Su Can walk in after waving goodbye to Su Xiaoxiao, he lowered his head slightly, not looking at him, and calmly wrote formulas on the draft paper with a black gel pen.
