b: \(8^{10}-8^9-8^8=8^8\left(8^2-8-1\right)=8^8\cdot55⋮55\)

c: 5^5-5^4+5^3

=5^3(5^2-5+1)

=5^3*21 chia hết cho 7

e:

72^63=(3^2*2^3)^63=3^126*2^189

 \(24^{54}\cdot54^{24}\cdot10^2=2^{162}\cdot3^{54}\cdot3^{72}\cdot2^{24}\cdot2^2\cdot5^2\)

\(=2^{188}\cdot3^{136}\cdot5^2\) chia hết cho 3^126*2^189

=>ĐPCM

g: \(=\left(3^4\right)^7-\left(3^3\right)^9-3^{26}\)

\(=3^{26}\left(3^2-3-1\right)=5\cdot3^{26}=5\cdot9\cdot3^{24}⋮5\cdot9=45\)

8¹⁰-8⁹-8⁸

= 8⁸(8²-8¹-8⁰)

= 8⁸.55 chia hết cho 55

Vậy 8¹⁰-8⁹-8⁸

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

chọn mk nha

\(2^{10}+2^{11}+2^{12}\)

\(=2^9.\left(2+2^2+2^3\right)\)

\(=2^9.14\)

\(=2^8.28\)

Ta có: \(28⋮28\)

\(\Rightarrow2^8.28⋮28\)

\(\Rightarrow2^{10}+2^{11}+2^{12}⋮28\)

                            đpcm

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

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

\(=8^8.55\)

Ta có: \(55⋮55\)

\(\Rightarrow8^8.55⋮55\)

\(\Rightarrow8^{10}-8^9-8^8⋮55\)

                             đpcm

Tham khảo nhé~

\(2^{10}+2^{11}+2^{12}=2^8\left(4+8+16\right)=2^8\cdot28\)

vi 28 chia het cho 28 nen 2⁸*28 chia het cho 28 suy ra 2¹⁰+2¹¹+2¹² chia het cho 28

tg tu cau b nha

8¹⁰-8⁹-8⁸

=8⁸(8²-8-1)

=8⁸.55

1 thua so chia het duong nhien tich nay chia het

Tick nha

ai tick mk 1 cái nữa thôi cho mk tròn 220 

nha

kho

8¹⁰ - 8⁹ - 8⁸

= 8⁸ . (8² - 8 - 1)

= 8⁸ . (64 - 8 - 1)

= 8⁸ . 55 chia hết cho 55

8¹⁰ - 8⁹ - 8⁸

=> 8⁸ . ( 8² - 8 - 1 )

=> 8⁸ . ( 64 - 8 - 1)

=> 8⁸ . 55 chia hết cho 55

8¹⁰ - 8⁹ - 8⁸ = 8⁸ . ( 8² - 8 - 1 )

= 8⁸ . 55 chia hết cho 55

Vậy chứng minh rằng 8¹⁰ - 8⁹ - 8⁸ chia hết cho 55

vieets nham r

1tinh 

5/4 chia 10/7

toan lop 4

a/ 8^10 - 8^9 - 8^8 

= 8^8 . 64 - 8^8 . 8 - 8^8 . 1 

= 8^8 . ( 64 - 8 - 1 ) = 8^8 . 55 chia hết cho 55 (đ.p.c.m )