Tính: A=$\frac{5.4^{15}.9^{9}-4.3^{20}.8^{9}}{5.2^{9}.6^{19}-7.2^{29}.27^{6}}$

Đáp án+Giải thích các bước giải:

 `A =( 5. 4^15 . 9^9 - 4 . 3^20 . 8^9 )/ ( 5 . 2^9 . 6^19 - 7.2^29) `

` A = (5.(2^2)^15 . (3^2)^9 - 2^2 . 3^20 . (2^3)^9)/(5.2^9 . ( 2.3)^19 - 7.2^19 - 7.2^29 . (3^3)^3)`

` A = (5 . 2^30 . 3^18 - 2^2 . 3^20 . 2^27) / ( 5. 2^9 . 6^19 . 3^19 - 7.2^29 . 3^18 ) `

` A = (5.2^30 . 3^18 - 2^29 . 3^20)/(5. 2^28 . 3^19 - 7.2^29 . 3^18)`

`A = (2^29 . 3^18(5.2 - 3^2))/(2^28 . 3^18 (5.3 - 7.2))`

`A = (2.(10-9))/(15-14) `

`A = 2`