(2n+1)(2n+3)=111555解方程
问题描述:
(2n+1)(2n+3)=111555解方程
答
令a=2n+1 b=2n+3
则a*b=111555=3*3*5*37*67=333*335
b-a=2
所以a=333 或 -335
b=335 或 -333
n=166 或 -168
答
(2n+1)(2n+3)=111555=111*1005=111*5*3*67=333*335
2n+1=333
n=166
答
(2n+1)(2n+3)=111555
设x=2n+2,原式可化为:
(x-1)(x+1)=111555
x^2-1=111555
x^2=111556
x=334
2n+2=334
2n=332
n=166
答
111555=5*67*111*3=335*333
所以2n+1=333,n=166
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