First, the sign of quantity is 3/4, π; A, x, etc.
Second, operation symbols such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or-), comparison sign (:), etc.
Third, relational symbols such as "=" are "equal signs" and are pronounced "equal"; ≈ or ≈ = ≈ is ≈ about equal sign ≈ pronounced ≈ about equal to ≈; "≦" is "unequal". Read "not equal to"; ">" is "greater than symbol" and is pronounced "greater than"; "
Four, combination symbols such as brackets (), brackets [], braces {}.
5. Natural symbols such as plus sign (+), minus sign (-) and absolute value sign (||).
6. Abbreviation symbols such as triangle (△), circle (⊙), power (), etc.
Look at it! In mathematics-yes, it should be a minus sign!
Have a look, do you understand? If not, I'll explain!
To be honest, the most important thing here is the method. If the method is mastered, similar problems can be solved!
I hope my answer is helpful to you. Good luck! Try such questions more yourself, and it will be fine next time!
I wish you progress in your study!