0,16 : x+ 2/5=2
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a) (3x-2):\(1\frac{2}{5}\)=\(2\frac{3}{7}\)
(3x-2):\(\frac{7}{5}\)=\(\frac{17}{7}\)
3x-2 =\(\frac{17}{7}.\frac{7}{5}\)
3x-2 =\(\frac{17}{5}\)
3x =\(\frac{17}{5}+2\)
3x =\(\frac{27}{5}\)
x =\(\frac{27}{5}:3\)
x =\(\frac{27}{5}.\frac{1}{3}\)
x =\(\frac{9}{5}\)
b) x:0,16=9:x
x.x =9.0,16
x2 =\(\frac{36}{25}\)
x2 =\(\left(\frac{6}{5}\right)^2\)
⇒x =\(\frac{6}{5}\)
a) Ta có: \(\left(3x-2\right):1\frac{2}{5}=2\frac{3}{7}:2\frac{3}{5}\)
\(\Leftrightarrow\left(3x-2\right):\frac{7}{5}=\frac{17}{7}:\frac{13}{5}\)
\(\Leftrightarrow\left(3x-2\right)\cdot\frac{5}{7}=\frac{17}{7}\cdot\frac{5}{13}=\frac{85}{91}\)
\(\Leftrightarrow3x-2=\frac{85}{91}:\frac{5}{7}=\frac{85}{91}\cdot\frac{7}{5}=\frac{17}{13}\)
\(\Leftrightarrow3x=\frac{17}{13}+2=\frac{43}{13}\)
\(\Leftrightarrow x=\frac{43}{13}:3=\frac{43}{13}\cdot\frac{1}{3}\)
hay \(x=\frac{43}{39}\)
Vậy: \(x=\frac{43}{39}\)
b) ĐKXĐ: x≠0
Ta có: \(\frac{x}{0.16}=\frac{9}{x}\)
\(\Leftrightarrow x\cdot x=9\cdot0.16\)
\(\Leftrightarrow x^2=1.44\)
hay \(x\in\left\{1.2;-1.2\right\}\)(nhận)
Vậy: \(x\in\left\{1.2;-1.2\right\}\)
a) \(\frac{3x-2}{1\frac{2}{5}}=\frac{2\frac{3}{7}}{2\frac{3}{5}}\Rightarrow3x-2=1.\frac{2}{5}.\frac{2\frac{3}{7}}{2\frac{3}{5}}=\frac{7}{5}.\frac{17}{7}.\frac{5}{13}\)
\(3x-2=\frac{17}{13}\Rightarrow3x=2+\frac{17}{13}=\frac{43}{13}\Rightarrow x=\frac{43}{39}.\)
b) \(\frac{x}{0,16}=\frac{9}{x}\Rightarrow x^2=9.0,16=1,44\Rightarrow x=\pm1,2\)
\(a,x\times3=8,4\)
\(x=8,4\div3\)
\(x=2,8\)
\(b,5\times x=0,25\)
\(x=0,25\div5\)
\(x=0,05\)
\(c,0,16\div x=2-0,4\)
\(0,16\div x=1,6\)
\(x=0,16\div1,6\)
\(x=0,1\)
Học tốt
x×3=8,4
x=8,4:3
x=2,8
vậy x=2,8
5×x=0,25
x=0,25:5
x=0,05
0,16:x=2-0,4
0,16:x=1,6
x=0,16:1,6
x=0,1
vậy x=0,1
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
\(0.16:x+\frac{2}{5}=2\)
\(\frac{4}{25}:x+\frac{2}{5}=2\)
\(\frac{4}{25}:x=2-\frac{2}{5}\)
\(\frac{4}{25}:x=\frac{8}{5}\)
\(x=\frac{4}{25}:\frac{8}{5}\)
\(x=\frac{1}{10}\)
x = 1 nha bn