Step 1, set the computer input method to Chinese, and then stop the mouse at the input place that needs to be input, as shown in the following figure;

Step 2: Click the blank space with the mouse, then press the "V" character on the keyboard, hold down the "V" key and then press the Arabic numeral "1", as shown in the following figure;

Step 3: After inputting "V" and Arabic numeral "1", a line of punctuation marks and hieroglyphs will appear, and then press the next page until the mathematical symbols are found to be parallel and equal to ≦, as shown below;

Baidu encyclopedia-mathematical symbols