cho A = 5 . 4^15 . 9^9 – 4 . 3^20 . 9^8 B = 5 . 2^9 . 6^19 – 7 . 2^29 . 27^6 Tính A : B C = 2181 . 729 + 243 . 81 . 27 D =

A = 5 . 4^15 . 9^9 – 4 . 3^20 . 9^8

A=5.2^30 . 3^18 –  2^2 . 3^ 36

A= 3^18 . 2^2 (5.2^28-3^18)

B=5 . 2^9 . 6^19 – 7 . 2^29 . 27^6 

B= 5.2^28.3^19- 7.2^29.3^18

B= 2^28. 3^18 (5.3 – 7.2)

=> A:B= 2^26 .(5.2^28-3^18)

C = 2181 . 729 + 243 . 81 . 27

C= 3^5.727  + 3^12

C= 3^5( 727- 2181)

C= 3^5.(-1460)

D = 3^2 . 9^2 . 243 + 18 . 243 . 324 + 723 . 729 

D= 3^12+ 2^3.3^11+3^7.241

D= 3^7 .( 3^5+ 8.3^4+241)

=> C:D= -365/1132