Taking Baidu input method as an example, the method of inputting root number by mobile phone is:

1, turn on the phone, input the input method, and select any input method.

2. After clicking the "Symbol" button, a vertical option will appear on the left. Slide down to find the Math option, and then click Enter.

3. Then you can see the root sign in the dialog box of mathematical symbols. Click this symbol, the root number will appear in the input box, then click the number "3" button, and the root number 3 will be typed.

Data expansion: Input method refers to the coding method used to input various symbols into electronic information equipment. In China, to input Chinese characters into computers, mobile phones and other electronic devices, Chinese input method is needed, and the coding method of Chinese character input is basically completed according to sound, form and meaning.