IF you need to change the screen

Click on the window picture and p on the keyboard together.

Math keys

https://drive.google.com/drive/folders/17AOQX56b8SHHBjydjfcr-0HM7JMcuRI8?usp=sharing

rounding

Thank you~

Thank you for subbing. Feel free to use the bog materials according to your need.

谢谢代课