What rules can you find by observing the following formulas? 1*3+1=4=2^2 2*4+1=9=3^2 3*5+1=25=5^2. (1) Please write two more equations according to your observation (2) According to the same number equation, please put the rules you find out in letters
1、4*6+1=25=5^2 5*7+1=36=6^2
2、n*(n+2)+1=(n+1)^2