tìm x biết a/1/8<x/40<1/5 B/4/-5<x/10<-1/2 C/x/5<4/x<x/3

1 câu trả lời

       Ron

`a. 1/8<x/40<1/5`

`=> 1.5/8.5<x/40<1.8/5.8`

`=> 5/40<x/40<8/40`

`=> 5<x<8`

`=> x in{6 ; 7 ; 8}`

`Vây` `x in {6;7;8}`

`b. 4/-5<x/10<{-1}/2`

`=> {-4.2}/5.2<x/10<{-1.5}/2.5`

`=>{-8}/5<x/10<{-5}/10`

`=> -8 < x < -5`

`=> x in {-7 ; -6}`

`Vậy` `x in {-7;-6}`

`c.` `\text{Sorry nha mik k bt lm}`

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