How to input parentheses in onion mathematics: press (shift+ctrl) to select the input method-a keypad will appear conveniently on the screen-click the keypad with the right mouse button-it will appear (special symbols, numerical symbols, mathematical symbols, punctuation marks, tabs and other options)-click the left mouse button to select the desired symbol.

1, the top of the letter key is on the same key as the number 8. When inputting, you need to hold down the "shift" and the number "8" keys above the primary and secondary keys at the same time to display the multiplication sign.

2. On the top of the numeric keypad, you don't need to hold down the "shift" key when inputting, and all symbols will be displayed. Click on it.

3. When inputting the handwritten version of cross multiplication, you need to insert symbols. Taking sogou input method as an example, the operation is as follows:

(1) Stop the cursor at the position where you want to insert the symbol to display the input method.

(2) Right-click the input method and select Soft Keyboard-Mathematical Symbol.

(3) In the dialog box that appears, click the key of the letter R with the mouse and insert ×.