## Làm full nha.thanks!

Question

Làm full nha.thanks!

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1 year 2020-11-04T09:35:33+00:00 2 Answers 51 views 0

1. 1.

b) 25 = 5 mũ 2

e) 216 = 6 mũ 3

h) 81 = 9 mũ 2 = 3 mũ 4

c) 64 = 8 mũ 2 = 2 mũ 6

f) 36 = 6 mũ 2

k) 16 = 4 mũ 2 = 2 mũ 4

Chúc bạn học tốt.

mk chỉ biết vậy nên xin bạn đừng giận

2. Giải thích các bước giải:

$\text{Bài 1:}$

$b)25=5^2$

$e)216=$

$h)81=9^2=3^4$

$c)64=4^3=8^2$

$f)36=6^2$

$k)16=4^2=2^4$

$\text{Bài 2:}$

$D)125^4.25^3.5^{24}=(5^3)^4.(5^2)^3.5^{24}$

$=5^{12}.5^6.5^{24}$

$=5^{42}$

$E)25^3.125=(5^2)^3.5^3$

$=5^6.5^3$

$=5^9$

$H)a^3.a^9=a^{12}$

$K)(a^5)^7=a^{35}$

$\text{Bài 3:}$

$a)16^6:4^2=16^6:16=16^5$

$b)27^8:9^4=(3^3)^8:(3^2)^4=3^{24}:3^8=3^{16}$

$c)125^5:25^3=(5^3)^5:(5^2)^3=5^{15}:5^6=5^9$

$\text{Bài 4:}$

$a)2^x-15=113$

$⇔2^x=128$

$⇔2^x=2^7$

$⇔x=7$

$\text{Vậy$x=7$}$

$b)(7x-11)^3=2^5.5^2+200$

$⇔(7x-11)^3=1000$

$⇔(7x-11)^3=10^3$

$⇔7x-11=10$

$⇔7x=21$

$⇔x=3$

$\text{Vậy$x=3$}$

$c)(2x+1)^3=343$

$⇔(2x+1)^3=7^3$

$⇔2x+1=7$

$⇔2x=6$

$⇔x=3$

$\text{Vậy$x=3$}$

$d)720:[41-(2x-5)]=2^3.5$

$⇔720:(41-2x+5)=40$

$⇔41-2x+5=720:40=18$

$⇔-2x=18-46=-28$

$⇔x=14$

$\text{Vậy$x=14$}$

Học tốt!!!