(2n+1)(2n+3)=111555解方程
问题描述:
(2n+1)(2n+3)=111555解方程
答
111555=111*1005=37*3*3*5*67
37*3*3=333 67*5=335
(2n+1)(2n+3)=111555
(2n+1)²+2(2n+1)-333*335=0
(2n+1+335)(2n+1-333)=0
(2n+336)(2n-332)=0
n=-168或者n=166