[(9^3+8^2-7^3×6^2÷5+2000.4-0.8)÷sin30×6-㏑e]×2-624= 13 14；

Extended data:

There is a formula for calculating any number, and the result is always 520. 13 14. Excuse me, this formula is:

Think of a number in your head, add 52.8, multiply it by 5, subtract 3.9343, divide it by 0.5, and finally subtract ten times the number in your head.

To verify:

((X+52.8)×5-3.9343)÷0.5- 10X =(X+52.8)× 10-7.8686- 10X = 528-7.8686 = 520. 13 14 .