2×4=5方-1 3×5=4方-1 4×6=5方-1 11×13=12方-1 求第n个式

问题描述:

2×4=5方-1 3×5=4方-1 4×6=5方-1 11×13=12方-1 求第n个式

(n+1)(n+3)=(n+2)^2-1