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0,16:x=x:36
0,16/x=x/36
x^2=144/25
x^2=(12/5)^2;x^2=-(12/5)^2
x=12/5. ; x=-12/5
tick nha bn
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\(\frac{0,16}{x}=\frac{x}{25}\)
\(x.x=0,16.25\)
\(x.x=\left(0.4\right)^2.5^2\)
\(x=2;x=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đk x khác 0
với Đk trên ta có:
x:0,16=9:x
x/0,16=9/x
x.x=0,16.9
x2=1.44
x=1.2( thỏa mãn Đk)
(2x-1)4=81
(2x-1)4=34
2x-1=3
x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
(x-1):0,16=-9.(1-x)
=>(x-1):0,16=-9:(-1):(x-1)
=>(x-1):0,16=9:(x-1)
=>(x-1).(x-1)=9.0,16
=>(x-1)2=1,44=1,22=(-1,2)2
=>x-1=1,2=>x=2,2
hoặc x-1=-1,2=>x=-0,2
Vậy x=2,2
x=0,2
Tính các góc của tam giác MNP biết M=80 độ ; N - P =30 độ
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{x}{0,16}=\frac{9}{x}\)
\(\Rightarrow x^2=0,16.9=\frac{36}{25}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{9}{5}\\x=-\frac{9}{5}\end{array}\right.\)
\(\frac{x}{0,16}=\frac{9}{x}\)
\(\Leftrightarrow x.x=0,16.9\)
\(\Leftrightarrow x^2=1,44=\left(\pm1,2\right)^2\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=1,2\\x=-1,2\end{array}\right.\)
Vậy \(x\in\left\{1,2;-1,2\right\}\)
Chúc bạn học tốt!
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a) \(\frac{11}{10,5}=\frac{6,32}{-x}\)
\(6,32:\frac{11}{10,5}=x\)
\(\frac{1659}{275}=x\)
b) \(\frac{x-1}{x+5}=\frac{6}{7}\)
\(\Rightarrow7x-7=6x+30\)
\(7x-6x=30+7\)
\(x=37\)
c) \(\frac{x^2}{6}=\frac{24}{25}\)
\(x^2=\frac{144}{25}\)
\(x=\frac{12}{5}\)
d) \(x:0,16=9:x\)
\(\frac{x}{0,16}=\frac{9}{x}\)
\(x^2=1,44\)
\(x=1,2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. X : (-1/3)^2=-1/3
X : 1/9 =-1/3
X= -1/3 : 1/9
X= -3
2. X : 0,16 =9:X
X = 9 : X . 0,16
X =(9.0,16):X
X =1,44:X
X . X=1,44
X2 =1,44
=>X= 1,2
3. (-1/2)^3 . X=(-1/2)^5
-1/8 . X=-1/32
X =-1/32 : -1/8
X =0,25
4. |X+4/5| - 1/7 = 0
|X+4/5|=0+1/7
|X+4/5|=1/7
=>X+4/5=1/7 HOẶC X + 4/5 = -1/7
Nếu X+4/5=1/7
X=1/7- 4/5
X=-23/35
Nếu X+4/5 =- 1/7
X=-1/7 - 4/5
X=-33/35
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x:0,16=9:x\)
\(\Rightarrow x^2=0,16.9\)
\(\Rightarrow x^2=1,44\)
\(\Rightarrow x=\pm1,2\)
\(x=\pm2\)