\(8^{10}-8^9-8^8=8^8\left(8^2-8-1\right)=8^8\left(64-8-1\right)=8^8\cdot55\)\(55\) chia hết cho 55

8¹⁰ - 8⁹ - 8⁸ = 8⁸.(8² - 8 - 1) = 8⁸.55 chia hết cho 55

\(a,8^{10}-8^9-8^8=8^8\left(8^2-8-1\right)=8^8\left(64-8-1\right)=8^8.55⋮55\left(\text{đpcm}\right)\)

\(b,81^7-27^9-9^{13}=3^{28}-3^{27}-3^{26}=3^{26}\left(3^2-3-1\right)=3^{26}.5=3^{24}\left(3^2.5\right)=3^{24}.45⋮45\left(\text{đpcm}\right)\)

hi

8¹⁰-8⁹-8⁸

=8⁸ ( 64 - 8 - 1 )

=8⁸ . 55 chia hết cho 55

\(\)Ta có: \(8^{10}-8^9-8^8=8^2\left(8^8-8^7-8^6\right)\)

                                           \(=8^2.55\)chia hết cho 55

8¹⁰ - 8⁹ - 8⁸ 

= 8⁸ . (8² - 8 - 1)

= 8⁸ . (64 - 8 - 1)

= 8⁸ . 55 chia hết cho 55

=> đpcm

8¹⁰ - 8⁹ -  8⁸  nha ae sr

\(8^{10}-8^9-8^8\)

\(=8^8.\left(8^2-8-1\right)\)

\(=8^8.\left(64-8-1\right)\)

\(=8^8.55⋮55\left(đpcm\right)\)

\(8^{10}-8^9-8^8=8^8.\left(8^2-8-1\right)\)

                           \(=8^8.\left(64-8-1\right)\)

                           \(=8^8.55⋮55\)

Vậy: \(8^{10}-8^9-8^8⋮55\) \(\left(Đpcm\right)\)

\(8^{10}-8^9-8^8=8^8\left(8^2-8-1\right)=8^8\left(64-8-1\right)=55.8^8⋮55\)

\(=8^8\left(8^2-8-1\right)=8^8.65⋮65\)

Xin lỗi mk chỉ làm được phần a thuivif mk đang bận chiều mk làm cho

81 ^ 7 - 27 ^ 9 - 9 ^ 13 = 3 ^ 28 - 3 ^ 27 - 3^ 26 = 3 ^ 26 

= ( 3 ^ 2 - 3 - 1 ) = 3 ^ 26 x 5 = 3 ^ 24 x 45 chia hết cho 45

Câu 1: 

a: \(=8^8\left(8^2-8-1\right)=8^8\cdot55⋮55\)

b: \(=3^{28}-3^{27}-3^{26}=3^{26}\left(3^2-3-1\right)=3^{26}\cdot5=3^{24}\cdot45⋮45\)

c: \(=7^4\left(7^2+7-1\right)=7^4\cdot55⋮11\)