求这两个一元二次方程的解:6(n+1)² > n(n+1)(2n+1) 6n² > n(n-1)(2n-1)
问题描述:
求这两个一元二次方程的解:6(n+1)² > n(n+1)(2n+1) 6n² > n(n-1)(2n-1)
答
由6(n+1)² > n(n+1)(2n+1)得,2n²-5n-6由6n² > n(n-1)(2n-1)得,(9-√73)/4
答
答:
(1)
6(n+1)² > n(n+1)(2n+1)
当n+1>0,即n>-1时:
6n+6>2n^2+n
2n^2-5n-6