Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
(13.3x-2-3x):2=162
<=>3x-2(13-32)=162.2
<=>3x-2.4=324
<=>3x-2=324:4
<=>3x-2=81=34
<=>x-2=4
<=>x=6
Vậy...
Ta có: \(\left(13.3^{x-2}-3^x\right)\div2=162\)
\(\Leftrightarrow13.3^{x-2}-3^{x-2+2}=162.2\)
\(\Leftrightarrow13.3^{x-2}-3^2.3^{x-2}=324\)
\(\Leftrightarrow\left(13-9\right).3^{x-2}=324\)
\(\Leftrightarrow4.3^{x-2}=324\)
\(\Leftrightarrow3^{x-2}=\dfrac{324}{4}=81=3^4\)
\(\Leftrightarrow3^{x-2}=3^4\Leftrightarrow x-2=4\Leftrightarrow x=6\)
Vậy \(x=6\)
Ta có :
\(\left(13.3^{x-2}-3x\right):2=162\)
\(\Rightarrow3^{x-2}\left(13-3^2\right)=162.2\)
\(\Rightarrow3^{x-2}.4=324\)
\(\Rightarrow3^{x-2}=324:4\)
\(3^{x-2}=81\)
\(3^{x-2}=3^4\)
\(\Rightarrow x-2=4\)
\(x=4+2\)
\(x=6\)
Vậy \(x=6\) là giá trị cần tìm
~ Chúc bn học tốt ~
a, = 2^30.3^30.3^11.7-2^31.5.3^40
= 2^30.3^41.7-2^31.5.3^40
= 2^30.3^40.(3.7-2.5) = 2^30.3^40.11
b, = 2^28.17.3^38-2^27.3^27.3^11
= 2^28.17.3^38-2^27.3^38
= 2^27.3^38.(2.17-1) = 2^27.3^38.33
k mk nha
34 + 52 : ( x + 1 ) = 13 . 3
34 + 25 : ( x + 1 ) = 39
25 : ( x + 1 ) = 39 - 34
25 : ( x + 1 ) = 5
x + 1 = 25 : 5
x + 1 = 5
x = 6
+ >34 + 52 : ( x + 1) = 13.3
52 : ( x + 1)= 39-34
52 : ( x + 1)=5
x + 1 = 5
x = 5-1
x = 4
+> 11+ 23 . 3 ( x - 13 ) = 35
23 . 3 ( x - 13 ) = 35 - 11
23 . 3 ( x - 13 )= 24
3 ( x - 13 )= 3
x - 13= 3:3
x - 13=1
x= 1+13
x= 14
\(13\cdot3^3+17\cdot3^3=3^3\cdot\left(13+17\right)\\ =3^3\cdot30=27\cdot30=810\)
13.3^3+17.3^3
=13.27+17.27
=27.(13+17)
=27.30
=810