a) 5^3 x 5^6

= 5^3+6

= 5^9

b) 3^4 x 3

= 3^4+1

= 3^5

nha bn

a) 5³ . 5⁶ = 5⁹ ; b) 3⁴ . 3 = 3⁵

a ) 5³.5⁶

= 5³⁺⁶

= 5⁹

b ) 3^4.3

= 3¹²

Answer : a ) 5⁹

b ) 3¹²

1.a)5³.5⁶=5³⁺⁶=5⁹

b)3⁴.3=3⁵

2.8=2³

16=4²=2⁴

125=5³

3.10000=10⁴

100...0 có 9 chữ số = 10⁹

\(5^6:5^3=5^{6-3}=5^3\)

\(a^4:a=a^4:a^1=a^{4-1}=a^3\)

a)=5³

b)=a³

(x+2)(x+2)=

a) \(15^3\cdot5\cdot15^4\cdot3\)

\(=15^3\cdot15^4\cdot\left(5\cdot3\right)\)

\(=15^3\cdot15^4\cdot15\)

\(=15^{4+3+1}\)

\(=15^8\)

b) \(243:3^3\)

\(=3^5:3^3\)

\(=3^{5-3}\)

\(=3^2\)

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

Viết kết quả phép tính dưới dạng một lũy thừa :

a) 3^15 :3^5=59049=3^10

b) 4^6 :4^6=1=4^0

a) \(3^{15}:3^5=3^{15-5}\)

                  \(=3^{10}\)

b) \(4^6:4^6=4^{6-6}\)

                \(=4^0\)

a) 3¹⁵ : 3⁵ = 3^15-5 = 3¹⁰ 

b) 4⁶ : 4⁶ = 1 <=> 4¹ hoặc 1¹ 

5^6 : 5^3 = 5^3

a^4 : a = a^3

k mình nha

5⁶:5³=5^6-3=5³

a⁴:a=a^4-1=a³

5⁶:5³=5^6-3=5²

a⁴:a=a^4-1=a³

(a kkac0)

** mk nha