(2n-9)(2n-7)/(2n+5)(2n-3)
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(2n-9)(2n-7)/(2n+5)(2n-3)(2n-9)(2n-7)/(2n+5)(2n-3)(2n-9)(2n-7)/(2n+5)(2n-3)(2n-9)(2n-7)/(2n+5)(2n-3)
(2n-9)(2n-7)/(2n+5)(2n-3)
(2n-9)(2n-7)/(2n+5)(2n-3)
(2n-9)(2n-7)/(2n+5)(2n-3)
(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<n<3/2或7/2<n<9/2
(2n-9)(2n-7)/(2n+5)(2n-3) 这是一个分段函数，结果是 -2.5<n<1.5,3.5<n<4.5你分段去解就好办了，两边同乘以分母就化简了，注意，如果分母是负数，小于号要变成大于号 (2n-9)(2n-7) 蓝色 (2n+5)(2n-3)红色 都是正数或者负数，就大于零，否则小于零
有可能使物体做匀速直线运动的是：A.4N 5N 7N B.3N 4N 8N C.2N 5N 9N D.5N 7N 13N然后我想问一下为什么
2^n/n*(n+1)
(2n-9)(2n-7)/(2n+5)(2n-3)
解方程(2n+1)(n+1)n-(2n-21)(n-10)(n-11)=2(2n-9)(n-4)(n-5)
证明不等式：(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
lim(3^2n+5^n)/(1+9^n)3^2n or 5^n
(3^n+5^n)^2-(9^n+25^n)(n为正整数)
2^n*3^n*5^n+2/30^n
3(n-1)(n+3)-2(n-5)(n-2)
2^n*3^n*5^(n+1)/30^n
Sn=n(n+2)(n+4)的分项等于1/6[n(n+2)(n+4)(n+5)-(n-1)n(n+2)(n+4)]吗?
lim(3^2n+5^n)/(1+9^n)=?
n+(n+1)+(n+2)+(n+3)+(n+4)=5n+10这道题怎么解
(n+2)!/(n+1)!
1.（双选）一个10N的力可以分解为下面哪两个力?A.30N 5N B.20N 5N C.10N 5N D.10N 10N2..（双选）物体受共点力F1 F2 F3 作用匀速直线运动.这三个力的数值选取可能正确的是A.15N 5N 6N B.9N 2N 7N C.3N 4N 5N D.1N
1/[n(n+1)]+1/[(n+1)(n+2)]+1/[(n+2)(n+3)]+1/[(n+3)(n+4)]+[(n+4)(n+5)}怎么算谢谢了,
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