~ Bạn tham khảo ~
`[5.4^15 .9^9 - 4.3^20 .8^9]/[5.2^9 .6^19 - 7.2^29 .27^6]`
`=[5.2^30 .3^18 - 2^2 . 3^20 . 2^27]/[5.2^9 . 2^19 . 3^19 - 7 . 2^29 . 3^18]`
`=[5.2^30 .3^18 - 3^20 . 2^29]/[5.2^28 . 3^19 - 7 . 2^29 . 3^18]`
`=[2^29 .3^18(5.2-3^2)]/[2^28 . 3^18(5.3-7.2)]`
`=[2.1]/[1]`
`=2`