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`2x-15=-25`
`2x=-10`
`x=-5`
___________
`3/5<x/10<4/5`
`3/5=(3xx10)/(5xx10)=30/50`
`x/10=(5x)/(10xx5)=(5x)/50`
`4/5=(4xx10)/(5xx10)=40/50`
`=>30/50<(5x)/50<40/50`
`=>30<5x<40`
`=>x=7`
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\left(\dfrac{15}{2021}+\dfrac{16}{2022}-\dfrac{115}{2023}\right)\cdot\dfrac{3-2-1}{6}=0\)
\(\left(\dfrac{15}{2021}+\dfrac{16}{2022}-\dfrac{115}{2023}\right)\cdot\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\right)=\left(\dfrac{15}{2021}+\dfrac{8}{1011}-\dfrac{115}{2023}\right)\cdot\left(\dfrac{3}{6}-\dfrac{2}{6}-\dfrac{1}{6}\right)=\left(\dfrac{15}{2021}+\dfrac{8}{1011}-\dfrac{115}{2023}\right)\cdot0=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2020/2021<1
2021/2022<1
2022/2023<1
2023/2020=1+1/2020+1/2020+1/2020>1+1/2021+1/2022+1/2023
=>B>2020/2021+2021/2022+2022/2023+1/2021+1/2022+1/2023+1=4
![](https://rs.olm.vn/images/avt/0.png?1311)
a)211:{1026-[34+1]:41}
=211:{1026-82:41}
=211:211
=211-11=2
b) (35+13):44*(2022*2021-4082419)
=256:44*4043
=0*4043
=0
chú thích:
*=dấu nhân
(-2021).15+15.2022-95
=15.[(-2021)+2022]-95
=15.1-95
=15-96
=-80