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![](https://rs.olm.vn/images/avt/0.png?1311)
a/108.28=(10.2)8=208
b/108:28=(10:2)8=58
c/254.28=(52)4.28=58.28=(5.2)8=108
d/158.94=158.(32)4=158.38=(15.3)8=458
e/272:253=(33)2:(52)3=36:56=(3:5)6=(3/5)6
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(10^8.2^8=\left(10.2\right)^8=20^8\)
b)
\(10^8:2^8=\left(10:2\right)^8=5^8\)
c)
\(25^4.2^8=\left(5^2\right)^4.2^8=5^8.2^8=\left(2.5\right)^8=10^8\)
d)
\(15^8.9^4=15^8.\left(3^2\right)^4=15^4.3^4=45^4\)
e)
\(27^2:25^3=\left(3^3\right)^2:\left(5^2\right)^3=3^6:5^6=\left(\frac{3}{5}\right)^6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 108x28=(10x2)8=208
b,108:28=(10:2)8=58
c,244x28=244x(22)4=244x44=(24x4)4=964
d,158x94=158x(32)4=158x38=(15x3)8=458
e,272:253=(33)2:(52)3=36:56=(3:5)6=\(\left(\frac{3}{5}\right)^6\)
Dãy số có 2 chữ số chia hết cho 3 là:[12,15,....,99]
Khoảng cách của từng số hạng là 3
Số số hạng là: (99-12):3+1=30(số)
Vậy có 30 số có 2 chữ số chia hết cho 3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,10^8.2^8=\left(10.2\right)^8=20^8\)
\(b,10^8:2^8=\left(10:2\right)^8=5^8\)
\(c,25^4.2^8=25^4.\left(2^2\right)^4=25^4.4^4=\left(25.4\right)^4=100^4\)
\(d,15^8.9^4=15^8.\left(3^2\right)^4=15^8.3^8=\left(15.3\right)^8=45^8\)
\(e,27^2.25^3=\left(3^3\right)^2.\left(5^2\right)^3=3^6.5^6=\left(3.5\right)^6=15^6\)
a, 108 . 28
= ( 10 . 2 ) 8
= 208
b, 108 : 28
= ( 10 : 2 )8
= 58
c, 254 . 28
= ( 52 )4 . 28
= 58 . 28
= ( 5 . 2 ) 8
= 108
d, 158 . 94
= 158 . ( 32 )4
= 158 . 38
= ( 15 . 3 ) 8
= 458
e, 272 . 253
= ( 33 )2 . ( 52 ) 3
= 36 . 56
= ( 3 . 5 ) 6
= 15 6
a)![10^{8} . 2^{8} = (10.2) ^{8} = 20^{8}](http://latex.codecogs.com/gif.latex?10%5E%7B8%7D&space;.&space;2%5E%7B8%7D&space;=&space;(10.2)&space;%5E%7B8%7D&space;=&space;20%5E%7B8%7D)
b)
= ![(10:2)^{8} = 5 ^{8}](http://latex.codecogs.com/gif.latex?(10:2)%5E%7B8%7D&space;=&space;5&space;%5E%7B8%7D)
c)
= ![(5^{2})^{4}. 2^{8} = 5^{8} . 2 ^{8} = 10^{8}](http://latex.codecogs.com/gif.latex?(5%5E%7B2%7D)%5E%7B4%7D.&space;2%5E%7B8%7D&space;=&space;5%5E%7B8%7D&space;.&space;2&space;%5E%7B8%7D&space;=&space;10%5E%7B8%7D)
d)
= ![15^{8}. (3^{2})^{4} = 15^{8}. 3^{8} = (15.3)^{8} = 45 ^{8}](http://latex.codecogs.com/gif.latex?15%5E%7B8%7D.&space;(3%5E%7B2%7D)%5E%7B4%7D&space;=&space;15%5E%7B8%7D.&space;3%5E%7B8%7D&space;=&space;(15.3)%5E%7B8%7D&space;=&space;45&space;%5E%7B8%7D)
e)
= ![This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.](http://latex.codecogs.com/gif.latex?%283%5E%7B2%7D%29%5E%7B2%7D%20%3A%20%285%5E%7B2%7D%29%5E%7B3%7D%20%3D%203%5E%7B6%7D%20%3A%205%5E%7B6%7D%3D%20%28%5Cfrac%7B3%7D%7B5%7D%29%5E%7B6%7D)