@Bơ
`4.5. 6/12 .15.9 `
`=20. 6/12 .135`
`=10.135`
`=1350`
`{4.5.6}/{12.15.9}`
`=120/1620`
`=2/27`
`{4.5.6}/{12.15.9}`
`={1.1.12}/{3.3.3}`
`=2/27`
`6.8. 11/33 .16`
`=48.1/3 .16`
`=48. 16/3`
`=256`
`{6.8.11}/{33.16}`
`=528/528`
`=1`
`{6.8.11}/{33.16}`
`={48.11}/{33.16}`
`={3}/{3}`
`=1`