(2n-9)(2n-7)/(2n+5)(2n-3)
2个回答
(2n-9)(2n-7)/(2n+5)(2n-3)<0(2n-9)(2n-7)(2n+5)(2n-3)<0利用数轴穿根法得
-5/2
相关问题
1+3+5+7+9+.+(2n-1)+(2n+1)+(2n+3)=
1+2+3+4+5+6+7+8+9+…+n=n(n+1)/2 1+3+5+7+9+11+13+15+…+(2n-1)=n
lim(3n^2-2n+6)/(5n^2+7n+9)求数列的极限
1+3+5+7+9+.+(2n-1)+(2n+1)=
3/2*5/4*7/6*9/8*...2n+1/2n>根号n+1
3+5+7+9.+(2n+1)=168,n=?
数列求和Sn=1/1*3+4/3*5+9/5*7+……n^2/(2n-1)(2n+1)
(9n^2+n)^(1/2)/(2n+5)
1*2+2*3+3*4+4*5+5*6+6*7+…+n(n+1)=n(n+1)(n+2)/3
已知f(n)=(2n+7)•3 n +9,