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

AI BIẾT CHỈ MÌNH NHA !!!

\(5^3=125\)

\(14^2=196\)

Bài 1

a)5³ =125

b)14²=196

Bài 2

a)3⁸x3⁷=3⁸⁺⁷=3¹⁵=14348907

b) a³.a⁵.a⁶=a³⁺⁵⁺⁶=a¹⁴

Bài 3

25^n>1

49^n>1

81^n>1

144^n>1

121^n>1

169^n>1

243^n>1

343^n>1

225^n>1

128^n>1

Chúc bn hc tốt ><

\(3^8\cdot2^7\)

\(=3^7\cdot2^7\cdot3\)

\(=\left(3\cdot2\right)^7\cdot3=6^7\cdot3\)

\(=839808\)

\(3^8\times2^7=3^7\times3\times2^7=\left(3\times2\right)^7\times3=6^7\times3\)

a: \(3\cdot3\cdot3\cdot3\cdot3=3^5\)

b: \(y\cdot y\cdot y\cdot y=y^4\)

ta có :

\(3^3.7^3=\left(3.7\right)^3=21^3\)

3³7³=(3.7)³

a/ (2⁶.16) :4²

=(2⁶.2²) :(2²)²

=2⁸ : 2⁴=2⁴=16

b/ (5¹⁰:625) : 25

= (5¹⁰:5⁴) :5²

=5⁶ : 5²=5³=625

c/ (81.243):3

= (3⁴.3⁵) :3

= 3⁹ :3=3⁸ =6561

\(a,5\cdot p\cdot5\cdot p\cdot2q\cdot4q\)

\(=5^2\cdot p^2\cdot2\cdot q\cdot2^2\cdot q\)

\(=5^2\cdot2^3\cdot p^2\cdot q^2\)

\(b,a\cdot a+b\cdot b+c\cdot c\cdot c+d\cdot d\cdot d\cdot d\)

\(=a^2+b^2+c^3+d^4\)

#Urushi

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\(12^2.3.12^3.4=\left(4.3\right)^2.3.4=4^2.3^2.3.4=3^3.4^3=27.64=1728\)

\(12^2.3.12^3.4=12^5.3.4=\left(3.4\right)^5.3.4=3^5.4^5.3.4=3^6.4^6=729.4096=\text{2985984}\)

\(3^6.4^6\)