1 24 Let a small positive even number be x, then the square of (x+x+2) is equal to 36, and x=2 is obtained.

2,6 is set by the player's X rule (x+ 1)*x/2=2 1, and the result is x=6.

The titles of the third and fourth questions are unclear.

5. 100 or let the original price be x, then x*0.9* 1. 1=99, and the solution is x= 100.

6,614 I don't know if I understand your topic correctly. ...

Judging from the problem, 7-m-7x=x+ 1

M=6-8x Because X is not equal to 0 or-1, M is not equal to 6 or 14.