Question

giúp mìn với ạ :<

Answer 1

`@` Xét `|2x-4| < 10`

`<=>-10 < 2x-4 < 10`

`<=>-2 < x < 7`

    `=>C=(-2;7)`

`@` Xét `8 < |-3x+5|`

`**TH1:-3x+5 >= 0<=>x <= 5/3=>|-3x+5|=-3x+5`

   `=>8 < -3x+5`

`<=>x < -1` (t/m)   `(1)`

`**TH2:-3x+5 < 0<=>x > 5/3=>|-3x+5|=3x-5`

    `=>8 < 3x-5`

`<=>x > 13/3` (t/m)   `(2)

Từ `(1);(2)=>D=(-oo;-1)uu(13/3;+oo)`

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  `C nn D=(-2;-1)uu(13/3;7)`

`=>(CnnD)uuE=(-2;-1)uu(13/3;5]`