数学求平均值公式简介：Many people have been busy this year, many have been caught, and many have been missed. Some are bursting with tears, some are prosperous, and some are bankrupt. There are all kinds of things, all living beings.
Many people have been busy this year, many have been caught, and many have been missed. Some are bursting with tears, some are prosperous, and some are bankrupt. There are all kinds of things, all living beings.
