(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)<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