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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