Question

Thực hiện phép tính: 

a) 9² : ( 27³ . 81² )

b) ( 2 . 8⁴ . 27² + 4 . 6⁹ ) : ( 2¹² . 9³ . 31 )

Answer 1

#)Giải :

a)\(9^2\div\left(27^3.81^2\right)=9^2\div\left[\left(3^3\right)^3.\left(9^2\right)^2\right]=9^2\div\left(3^9.9^4\right)\)

Tự lm típ 

Answer 2

a,\(9^2:\left(27^3.81^2\right)=3^4:\left(3^9.3^8\right)=3^4:\left(3^{9+8}\right)=3^4:3^{17}=3^{-13}\)

Answer 3

\(a,\frac{9^2}{27^3.81^3}=\frac{3^4}{3^9.3^{12}}=\frac{1}{3^{17}}\)

\(b,\frac{2.8^4.27^2+4.6^9}{2^{12}.9^3.31}=\frac{2^{13}.3^6+2^22^9.3^9}{2^{12}.3^6.31}\)

\(=\frac{2^{11}.3^6\left(2^2+3^3\right)}{2^{12}.3^6}=\frac{4+27}{2}=\frac{31}{2}\)