Bài 6: 

a: \(2^{27}=8^9\)

\(3^{18}=9^9\)

b: Vì \(8^9< 9^9\)

nên \(2^{27}< 3^{18}\)

A=2 . 4 . 8 . 16 . 156

  =2. 2^2 . 2^3 . 2^4 . 2^7

  =2^17

B=5 . 25 .125 . 625 . 5^7

  =5 . 5^2 . 5^3 . 5^4 . 5^7

  =5^17

tích cho mk nha

a) (0.25)⁸ = (0.5²)⁸ = 0.5^2.8 = 0.5¹⁶

b) (0.125)⁴ = (0.5³)⁴ = 0.5^3.4 = 0.5¹²

Ta có:

\(\begin{array}{l}{\left( {\frac{1}{4}} \right)^8} = {[{\left( {\frac{1}{2}} \right)^2}]^8} = {(\frac{1}{2})^{2.8}} = {(\frac{1}{2})^{16}};\\{\left( {\frac{1}{8}} \right)^3} = {[{(\frac{1}{2})^3}]^3} = {(\frac{1}{2})^{3.3}} = {(\frac{1}{2})^9}\end{array}\)

2³⁰=2^3.10=(2³)¹⁰=8¹⁰

Sai rồi bạn, phải là

a)5⁶=5³.5³

b)7⁸=7⁴.7⁴

c)8⁵=8².8³

\(a,5^6=15625\)

\(b,7^8=5764801\)

\(c,8^5=32768\)

tks  2 bạn :D

1.
a) \(3^4\times3^5\times3^6=3^{4+5+6}=3^{15}\)

b) \(5^2\times5^4\times5^5\times25=5^2\times5^4\times5^5\times5^2=5^{2+4+5+2}=5^{13}\)

c) \(10^8\div10^3=10^{8-3}=10^5\)

d) \(a^7\div a^2=a^{7-2}=a^5\)

2.

\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)

\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)

\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)

còn bài 2

a) 2.2.2.2 = \({2^4}\). Cơ số 2, số mũ 4

b) 5.5.5 = \({5^3}\). Cơ số 5, số mũ 3

Ta có: +) \({({2^2})^3} = {2^2}{.2^2}{.2^2} = {2^{2 + 2 + 2}} = {2^6}\)

+) \({\left[ {{{( - 3)}^2}} \right]^2} = {( - 3)^2}.{( - 3)^2} = {( - 3)^{2 + 2}} = {( - 3)^4}\)