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\(a,\Rightarrow\left[{}\begin{matrix}x-\dfrac{2}{3}=\dfrac{5}{4}\\\dfrac{2}{3}-x=\dfrac{5}{4}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{23}{12}\\x=-\dfrac{7}{12}\end{matrix}\right.\\ b,\Rightarrow0,1x\cdot1,35=0,2\cdot1,25=0,25\\ \Rightarrow0,135x=0,25\Rightarrow x=\dfrac{50}{27}\\ c,ĐK:x\ge0\\ PT\Leftrightarrow-2\sqrt{x}=-6\Leftrightarrow x=9\left(tm\right)\\ d,\Leftrightarrow3^{x+2}\cdot2^{x-1}=\left(3^2\cdot2^2\right)^3=3^6\cdot2^6\\ \Leftrightarrow\left\{{}\begin{matrix}x+2=6\\x-1=6\end{matrix}\right.\Leftrightarrow x\in\varnothing\)
x + x : 0,2 = 1,35
x * 1 + x * 5 = 1,35
x * ( 1 + 5 ) = 1,35
x * 6 = 1,35
x = 1,35 : 6
x = 0,225
hok tốt nha ^_^
a) \(\frac{0,5}{0,2}=\frac{1,25}{0,1x}\Leftrightarrow0,1x.0,5=0,2.1,25\)
\(\Leftrightarrow0,1x.0,5=0,25\Leftrightarrow0,1x=0,5\Leftrightarrow x=5\)
b) \(x-\frac{3}{2}=2x-\frac{4}{3}\Leftrightarrow x-2x=\frac{-4}{3}+\frac{3}{2}\)
\(\Leftrightarrow x-2x=\frac{1}{6}\Leftrightarrow-x=\frac{1}{6}\Leftrightarrow x=\frac{-1}{6}\)
c) \(x+\frac{13}{14}=\frac{4}{7}\Rightarrow x=\frac{4}{7}-\frac{13}{14}\Rightarrow x=\frac{-5}{14}\)
d)\(-3\left(x-2\right)=2x+1\)
\(\Leftrightarrow-3x+6=2x+1\Leftrightarrow-3x-2x=1-6\)
\(\Leftrightarrow-5x=-5\Leftrightarrow x=1\)
e) \(\left(x-1\right)^2-4=0\Leftrightarrow\left(x-1\right)^2=4\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=2\\x-1=\left(-2\right)\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)
cậu có thể tham khảo bài trên ạ, nếu thấy đúng thì cho mk 1 t.i.c.k ạ, thank nhiều
\(d,-3\left(x-2\right)=2x+1\)
\(< =>-3x+6=2x+1\)
\(< =>-3x-2x+6-1=0\)
\(< =>5-5x=0\)
\(< =>5\left(1-x\right)=0< =>x=1\)
\(e,\left(x-1\right)^2-4=0\)
\(< =>\left(x-1+2\right)\left(x-1-2\right)=\left(x+1\right)\left(x-3\right)=0\)
\(< =>\orbr{\begin{cases}x+1=0\\x-3=0\end{cases}< =>\orbr{\begin{cases}x=-1\\x=3\end{cases}}}\)
a: \(\Leftrightarrow x^2=900\)
=>x=30 hoặc x=-30
b: \(\Leftrightarrow\dfrac{2}{3}:\left(-0.1x\right)=\dfrac{4}{3}:\dfrac{-2}{25}=-\dfrac{4}{3}\cdot\dfrac{25}{2}=-\dfrac{100}{6}=\dfrac{-50}{3}\)
=>0,1x=2/3:50/3=2/3x3/50=1/25
=>1/10x=1/25
hay x=1/25:1/10=10/25=2/5
d: \(\Leftrightarrow x^2=\dfrac{144}{25}\)
=>x=12/5 hoặc x=-12/5
a, \(-4x+5+2x-1=3\Leftrightarrow-2x=-1\Leftrightarrow x=\dfrac{1}{2}\)
b, \(-2x+2=2\Leftrightarrow x=0\)
c, \(-2x-6=-8\Leftrightarrow x=1\)
a) x2 = 16
\(\Rightarrow\) x = \(\pm\sqrt{16}\)
\(\Rightarrow\) x = \(\pm\)4
b) (x - \(\dfrac{1}{2}\))3 = \(\dfrac{1}{27}\)
\(\Rightarrow\) x - \(\dfrac{1}{2}\) = \(\sqrt{\dfrac{1}{27}}\)
\(\Rightarrow\) x - \(\dfrac{1}{2}\) = \(\dfrac{1}{3}\)
\(\Rightarrow\) x = \(\dfrac{5}{6}\)
a. \(\dfrac{2x}{3}:\dfrac{1}{5}=1\dfrac{1}{3}:\dfrac{1}{4}\Rightarrow\dfrac{2x}{3}\cdot\dfrac{1}{4}=\dfrac{1}{5}\cdot1\dfrac{1}{3}\Rightarrow\dfrac{2x}{3}=\dfrac{1}{5}\cdot1\dfrac{1}{3}:\dfrac{1}{4}=\dfrac{16}{15}\Rightarrow2x=\dfrac{16}{15}\cdot3=\dfrac{16}{5}\Rightarrow x=\dfrac{16}{5}:2=\dfrac{8}{5}\)
Vậy \(x=\dfrac{8}{5}\)
b. \(1,35:0,2=1,25:0,1x\Rightarrow1,35\cdot0,1x=0,2\cdot1,25\Rightarrow0,1x=\dfrac{0,2\cdot1,25}{1,35}=\dfrac{5}{27}\Rightarrow x=\dfrac{5}{27}:0,1=\dfrac{50}{27}\)
Vậy \(x=\dfrac{50}{27}\)
c. \(2:1\dfrac{1}{4}=\dfrac{1}{2}:2x\Rightarrow2\cdot\dfrac{4}{5}=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot x\Rightarrow\dfrac{8}{5}=\dfrac{1}{4}x\Rightarrow x=\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{32}{5}\)
Vậy \(x=\dfrac{32}{5}\)
\(a.\frac{1,35}{0,2}=\frac{1,25}{0,1x}\)
\(\frac{0,2\cdot1,25}{1,35}=0,1x\)
0,8 = 0,1x
x=8
b. 2x - 3 = x + 1/2
2x - 3 - x - 1/2=0
x-3,5 = 0
x= 3,5
c. (3x - 1/4 ) * ( x+ 1/2)=0