Question

x-5/x-3 <0

 

Answer 1

`[x-5]/[x-3] < 0`

`<=>[({(x-5 > 0),(x-3 < 0):}),({(x-5 < 0),(x-3 > 0):}):}`

`<=>[({(x > 5),(x < 3):}\text{  (Vô lí)}),({(x < 5),(x > 3):}<=>3 < x < 5):}`

Vậy `3 < x < 5`

Answer 2

=>x-3>0 và x-5<0

=>3<x<5