You can enter word. After opening word, hold down CTRL +F9, and enter eq\f(*, *) in the pop-up braces (note that there is a space behind eq, the slash is diagonal, the number to the left of comma is numerator, and the number to the right of comma is denominator).

2. After editing, select the code, that is, the * and * parts, and press F9, and the fractional form will appear.