8⁵.2³=(2³)⁵.2³=2¹⁵.2³=2¹⁵⁺³=2¹⁸

\(8^5.2^3=\left(2^3\right)^5.2^3\)

\(=2^{15}.2^3=2^{15+3}=2^{18}\)

\(8^5\) x \(2^3\) = \(8^5\)x  \(8\) = \(8^6\)

512²

ok

9^8:3^2=(3^2)^8:3^2=3^16:3^2=3^16-2=3^14

\(2^4.8=2^4.2^2=2^6=64\)

Sorry Tui nhầm .. 

\(2^4.8=2^4.2^3=2^7=124\)

2.4.8

=2\(^1\).2\(^2\).2\(^3\)

=2\(^{\left(1+2+3\right)}\)

=2\(^6\)

=64

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

\(8^5.2^3:2^4\)

\(=\left(2^3\right)^5.2^3:2^4\)

\(=2^{15}.2^3:2^4\)

\(=2^{18}:2^4=2^{14}=16384\)

 8⁵.2³:2⁴

= ( 2³)⁵ . 2³ : 2⁴

= 2¹⁵ . 2³ : 2⁴

= 2¹⁸ : 2⁴

= 2¹⁴

Hok tốt !

9^8:3^2=9^8:9=9^7 

9^8=43046721

3^2=9

k mk nha!

9⁸:3²

=9⁸:9

=9⁷

^{tk nha~~~~~~~~~~~~~~~~~}

thanks

Answer:

Áp dụng: \(x^n.x^m=x^{n+m}\)

\(x^2.x^5=x^{2+5}=x^7\)