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

(2n-1)*(2n+1)=2n`2-1