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\(a,2.16\le2^n< 4\)
\(\Rightarrow2^5\le2^n< 2^2\)
\(\Rightarrow n\in5,4,3\)
\(b,3^2.3^n=3^5\)
\(\Rightarrow3^n=3^5:3^2\)
\(\Rightarrow3^n=3^2\)
\(\Rightarrow n=2\)
\(c,\left(2^2:4\right):2^n=4\)
\(\Rightarrow1:2^n=4\)
\(\Rightarrow2^n=1:4=\frac{1}{4}\)
mà \(n\in N\)nên n ko có giá trị nào
\(d,\frac{1}{9}.3^4.3^n=3^7\)
\(\Rightarrow\left(\frac{1}{3}\right)^2.3^2.3^2.3^n=3^7\)
\(\Rightarrow3^2.3^n=3^7\)
\(\Rightarrow3^n=3^7:3^2\)
\(\Rightarrow3^n=3^5\)
\(\Rightarrow n=5\)
e,f làm tự làm tiếp nhé,mỏi tay wa
![](https://rs.olm.vn/images/avt/0.png?1311)
3600:[(5x+335):x]=50
(5x+335):x=3600:50
(5x+335):x=72
5x:x+335:x=72
5+335:x=72
335:x=72-5
335:x=67
\(\Rightarrow\)x=5
Vậy x=5
Đúng thì cho mình nha ^^
(5x+335):x=3600:50
(5x+335):x=72
=>5x+335=72x
=>335=72x-5x=67x
=>x=335:67=5
k cho mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời:
\(3600:\left[\left(5x+335\right):x\right]=50\)
\(\Leftrightarrow\left(5x+335\right):x=\dfrac{3600}{50}\)
\(\Leftrightarrow\left(5x+335\right):x=72\)
\(\Leftrightarrow\left(5x+335\right).\dfrac{1}{x}=72\)
\(\Leftrightarrow5x.\dfrac{1}{x}+335.\dfrac{1}{x}=72\)
\(\Leftrightarrow5+\dfrac{335}{x}=72\)
\(\Leftrightarrow\dfrac{335}{x}=67\)
\(\Leftrightarrow x=\dfrac{335}{67}\)
\(\Leftrightarrow x=5\)
Vậy \(x=5\).
Chúc bạn học tốt!
trả lời:
3600:[(5x+335):x]=50
=>(5x+335):x=3600:50
(5x+335):x=72
=>5x.1:x+335.1:x=72
=>=5+335:x=72
=>335:x=67
x=335:67
x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
3600:[(5x+335):x]=50
(5x+335):x=3600:50
(5x+335):x=72
5x+335=72x
355=72x-5x
355=67x
x=355:67
x=355/67
3600:[\(\frac{5.x+335}{x}\)] = 50
\(\frac{3600.x}{5.x+335}\)= 50
3600.x = 50.(5.x+335)
3600.x - 250.x = 16750
3350.x = 16750
=> x = 16750 : 3350 = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3600:\left[\left(5x+335\right):x\right]=50\)
\(\left[\left(5x+335\right):x\right]=3600:50\)
\(\left[\left(5x+335\right):x\right]=72\)
đến đây thì mik chịu ! Xin lỗi nhé !!!
3600 : [ ( 5x + 335) : x ] = 50
( 5x +335 ) : x = 3600 : 50
( 5x + 335 ) : x = 72
( 5x + 335 ) = 72x
=> 72x-5x = 335
67x = 335
=> x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
3600:[(5x+335):x]=50
=>(5x+335):x=3600:50=72
=>5x+335=72.x
=>72x-5x=335
=>67x=335
=>x=5
vậy x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
d)3600/[(5x+355)/x]=50
(5x+355)/x=3600/50
5+355/x=72
355/x=72-5
355/x=67
x=355/67
a, 3600: [ ( 5x + 35 ) : x ] = 50
<=> ( 5x + 35 ) : x = 72
<=> 5x + 35 = 72x
<=> 72x - 5x = 35
<=> 67x = 35
<=> x = 35/67
b, 2n-1 + 4 . 2n = 9 . 25
<=> 2n : 2 + 4 . 2n = 9 . 25
<=> 2n . 1/2 + 4 . 2n = 9 . 25
<=> 2n . ( 1/2 + 4 ) = 9 . 25
<=> 2n . 9/2 = 9 . 25
<=> 2n : 25 = 9 : 9/2
<=> 2n - 5 = 21
<=> n - 5 = 1
<=> n = 6