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\(\frac{-2}{3}\) \(-\) \(\frac{1}{3}\) X \(\left(2.x-5\right)\) \(=\frac{3}{2}\)
\(-1\) X \(\left(2.x-5\right)\) \(=\frac{3}{2}\)
\(\left(2.x-5\right)\) \(=\frac{3}{2}\) \(:-1\)
\(\left(2.x-5\right)\) \(=\frac{3}{2}\)
\(2.x\) \(=\frac{3}{2}\) \(+\) \(5\)
\(2.x\) \(=\frac{7}{2}\)
\(x=\) \(\frac{7}{2}\) \(:2\)
\(x=\frac{7}{4}\)
* Mới lớp 5 nên không chắc, sai thongcam *
#Ninh Nguyễn
\(\frac{-2}{3}-\frac{1}{3}\cdot\left(2x-5\right)=\frac{3}{2}\)
\(\frac{1}{3}\left(2x-5\right)=\frac{-2}{3}-\frac{3}{2}\)
\(2x-5=\frac{-13}{6}:\frac{1}{3}\)
\(2x=\frac{-13}{2}+5\)
\(x=\frac{-3}{2}:2\)
\(x=\frac{-3}{4}\)
| x | + | 2x - 3 | = 0 (1)
Ta có \(\hept{\begin{cases}\left|x\right|\ge0\\\left|2x-3\right|\ge0\end{cases}}\forall x\)
\(\Rightarrow\left|x\right|+\left|2x-3\right|\ge0\forall x\) (2)
Từ (1) và (2) => (1) \(\Leftrightarrow\) \(\hept{\begin{cases}\left|x\right|=0\\\left|2x-3\right|=0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=0\\2x-3=0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=0\\2x=3\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x=0\\x=\frac{3}{2}\end{cases}}\)
\(\Leftrightarrow x\in\varnothing\)
Vậy \(x\in\varnothing\)
@@ Học tốt
!!! K chắc
2/3.x + 1/4 = 7/12
2/3.x = 7/12 - 1/4
2/3.x = 1/3
x = 1/3 : 2/3
x = 1/2
Bài làm
\(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)
\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)
\(\frac{2}{3}x=\frac{7}{12}-\frac{3}{12}\)
\(\frac{2}{3}x=\frac{4}{12}\)
\(\frac{2}{3}x=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{2}{3}\)
\(x=\frac{1}{3}.\frac{3}{2}\)
\(x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
a) 2x - 3 = x + 1/2
<=> 2x - 3 = 1/2x + 1/2
<=> 2x - 3 - 1/2x = 1/2
<=> 3/2x - 3 = 1/2
<=> 3/2x = 1/2 + 3
<=> 3/2x = 7/2
<=> x = 7/2 : 3/2
<=> x = 7/3
=> x = 7/3
\(a,2x-3=x+\frac{1}{2}\)
\(2x-3=\frac{1}{2}x+\frac{1}{2}\)
\(2x-3-\frac{1}{2}x=\frac{1}{2}\)
\(\frac{3}{2}x-3=\frac{1}{2}\)
\(\frac{3}{2}x=\frac{1}{2}+3\)
\(\frac{3}{2}x=\frac{7}{2}\)
\(x=\frac{7}{2}:\frac{3}{2}\)
\(x=\frac{14}{6}=\frac{7}{3}\)
\(\)B làm tương tự
1/3:x=2-1/3
1/3:x=5/3
x=5/3×3/1
x=5
\(\frac{2}{3}\)\(+\)\(\frac{1}{3}\)\(\div\)\(x\)\(=\)\(2\)
\(\frac{1}{3}\)\(\div\)\(x\)\(=\)\(2-\frac{2}{3}\)
\(\frac{1}{3}\div x=\frac{4}{3}\)
\(x=\frac{1}{3}\div\frac{4}{3}\)
\(x=\frac{1}{4}\)