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11 tháng 4 2022

\(x+\dfrac{2}{0,5}=2x+\dfrac{1}{2}\)

\(\Leftrightarrow x+4-2x-\dfrac{1}{2}=0\)

\(\Leftrightarrow-x+\dfrac{7}{2}=0\)

\(\Leftrightarrow-x=-\dfrac{7}{2}\)

\(\Leftrightarrow x=\dfrac{7}{2}\)

9 tháng 8 2023

a) \(1=\left(2x+0,5\right)^{600}\)

\(\Rightarrow1^{600}=\left(2x+0,5\right)^{600}\)

\(\Rightarrow\left[{}\begin{matrix}2x+0,5=1\\2x+0,5=-1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}2x=0,5\\2x=-1,5\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=0,25\\x=-0,75\end{matrix}\right.\)

b) \(\left(x-0,125\right)^2=0,25\)

\(\Rightarrow\left(x-0,125\right)^2=0,5^2\)

\(\Rightarrow\left[{}\begin{matrix}x-0,125=0,5\\x-0,125=-0,5\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=0,625\\x=-0,375\end{matrix}\right.\)

c) \(\left(x-3\right)^{11}=\left(x-3\right)^{41}\)

\(\Rightarrow\left(x-3\right)^{11}-\left(x-3\right)^{41}=0\)

\(\Rightarrow\left(x-3\right)^{11}\left[1-\left(x-3\right)^{30}\right]=0\)

\(\Rightarrow\left[{}\begin{matrix}\left(x-3\right)^{11}=0\\\left(x-3\right)^{30}=1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x-3=0\\x-3=1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=3\\x=4\end{matrix}\right.\)

`@` `\text {Ans}`

`\downarrow`

`a)`

`1 = (2x + 0,5)^600`

`=> (2x+0,5)^600 = (+-1)^600`

`=> \text {TH1: } 2x + 0,5 = 1`

`=> 2x = 1 - 0,5`

`=> 2x = 0,5`

`=> x = 0,5 \div 2`

`=> x = 0,25`

`\text {TH2: } 2x + 0,5 = -1`

`=> 2x = -1 - 0,5`

`=> 2x = -1,5`

`=> x = -1,5 \div 2`

`=> x = -0,75`

Vậy, `x \in {-0,75; 0,25}.`

`b)`

`(x - 0,125)^2 = 0,25`

`=> (x - 0,125)^2 = (+-0,5)^2`

`=> `\(\left[{}\begin{matrix}x-0,125=0,5\\x-0,125=-0,5\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=0,5+0,125\\x=-0,5+0,125\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=0,625\\x=-0,375\end{matrix}\right.\)

Vậy, `x \in {-0,375; 0,625}.`

`c)`

`(x - 3)^11 = (x - 3)^41`

`=> (x - 3)^11 - (x - 3)^41 = 0`

`=> (x - 3)^11 * [ 1 - (x - 3)^30] = 0`

`=>`\(\left[{}\begin{matrix}\left(x-3\right)^{11}=0\\1-\left(x-3\right)^{30}=0\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x-3=0\\\left(x-3\right)^{30}=1\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=3\\x-3=1\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=3\\x=4\end{matrix}\right.\)

Vậy, `x \in {3; 4}.`

19 tháng 7 2018

a, \(\left|x+2\right|-\left|x+7\right|=0\Rightarrow\left|x+2\right|=\left|x+7\right|\Rightarrow\orbr{\begin{cases}x+2=x+7\\x+2=-x-7\end{cases}\Rightarrow\orbr{\begin{cases}0=5\left(loại\right)\\2x=-9\end{cases}\Rightarrow}x=\frac{-9}{2}}\)

b, - Nếu \(2x-1\ge0\Rightarrow x\ge\frac{1}{2}\), ta có: 2x - 1 = 2x - 1 => 2x = 2x (thỏa mãn với mọi x)

- Nếu 2x - 1 < 0 => \(x< \frac{1}{2}\), ta có: 2x - 1 = 1 - 2x => 4x = 2 => x = \(\frac{1}{2}\) (không thỏa mãn điều kiện)

Vậy \(x\ge\frac{1}{2}\)

c,d tương tự b

e, tương tự a

a) 9x-1/4=3/2

=>9x=3/2+1/4

=>9x=7/4

=>x=7/4:9

=>x=7/36

Vậy x=7/36

b)(4x+2):2,5=3,2:0,5

=>(4x+2):2,5=6,4

=>4x+2=6,4.2,5

=>4x+2=16

=>4x=16-2

=>4x=14

=>x=14:4

=>x=7/2

Vậy x=7/2

c) 5,4/x-2=6/7

=>5,4/x=6/7+2

=>5,4/x=20/7

=>x=5,4 :20/7

=>x=1,89

Vậy x= 1,89

d) 0,5:2=3:(2x+7)

=>3:(2x+7)=0,25

=>2x+7=3:0,25

=>2x+7=12

=>2x=12-7

=>2x=5

=>x=5/2

Vậy x=5/2

20 tháng 7 2023

a) 9x-1/4=3/2

=>9x=3/2+1/4

=>9x=7/4

=>x=7/4:9

=>x=7/36

Vậy x=7/36

b)(4x+2):2,5=3,2:0,5

=>(4x+2):2,5=6,4

=>4x+2=6,4.2,5

=>4x+2=16

=>4x=16-2

=>4x=14

=>x=14:4

=>x=7/2

Vậy x=7/2

c) 5,4/x-2=6/7

=>5,4/x=6/7+2

=>5,4/x=20/7

=>x=5,4 :20/7

=>x=1,89

Vậy x= 1,89

d) 0,5:2=3:(2x+7)

=>3:(2x+7)=0,25

=>2x+7=3:0,25

=>2x+7=12

=>2x=12-7

=>2x=5

=>x=5/2

Vậy x=5/2

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

28 tháng 7 2020

\(d,-3\left(x-2\right)=2x+1\)

\(< =>-3x+6=2x+1\)

\(< =>-3x-2x+6-1=0\)

\(< =>5-5x=0\)

\(< =>5\left(1-x\right)=0< =>x=1\)

\(e,\left(x-1\right)^2-4=0\)

\(< =>\left(x-1+2\right)\left(x-1-2\right)=\left(x+1\right)\left(x-3\right)=0\)

\(< =>\orbr{\begin{cases}x+1=0\\x-3=0\end{cases}< =>\orbr{\begin{cases}x=-1\\x=3\end{cases}}}\)