Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
5.(x-4)=123-38
5.(x-4)=85
x-4=85:5
x-4=17
x=17+4
x=21
Đúng 1000000000000000
( 3x/7 + 1 ) : (-4 ) = -1/28
3x/7 + 1 = -1/28 x (-4 )
(3x/7 + 1 = 1/7
3x/7 = 1/7 - 1
3x/7 = -6/7
Suy ra 3x = -6
x = -6 : 3
x = -2
9-(5x-7)=14-9(3x+1)
9-5x+7=14-27.x-9
16-5x=5-27x
11=-22.x
x=(-22):11=-2
T..i..c..k mk nha
9-(5x-7)=14-9(3x+1)
=>9-5x+7=14-27x+9
=>9-5x+7+27x=14+9
=>-5x+7+27x=14+9-9
=>-5x+27x=14-7
=>(5+27)x=7
=>32x=7
=>x=7:32
=>x=0,21875
\(a,2,5\cdot x=\frac{11}{15}\)
\(\Rightarrow x=\frac{11}{15}:2,5\)
\(\Rightarrow x=\frac{11}{15}:\frac{25}{10}\)
\(\Rightarrow x=\frac{11}{15}\cdot\frac{10}{25}\)
\(\Rightarrow x=\frac{11}{3}\cdot\frac{2}{25}=\frac{22}{75}\)
\(b,x-15\%\cdot x=\frac{1}{3}\)
\(\Rightarrow x-\frac{15}{100}\cdot x=\frac{1}{3}\)
\(\Rightarrow x-\frac{3}{20}\cdot x=\frac{1}{3}\)
\(\Rightarrow\frac{20x}{20}-\frac{3x}{20}=\frac{1}{3}\)
\(\Rightarrow\frac{17x}{20}=\frac{1}{3}\)
\(\Rightarrow17x\cdot3=20\)
\(\Rightarrow17x=\frac{20}{3}\)
\(\Rightarrow x=\frac{20}{3}:17=\frac{20}{3}\cdot\frac{1}{17}=\frac{20}{51}\)
Câu c mk làm sau :v
c,\(\left[\frac{3x}{7}+1\right]:\left[-4\frac{1}{7}\right]=\frac{-3}{28}\)
\(\Rightarrow\left[\frac{3x}{7}+1\right]:\left[-\frac{29}{7}\right]=\frac{-3}{28}\)
\(\Rightarrow\frac{3x}{7}+1=-\frac{3}{28}\cdot-\frac{29}{7}=\frac{87}{196}\)
\(\Rightarrow\frac{3x}{7}=\frac{87}{196}-1\)
Tìm nốt :v
\(\left(3x-4\right)\left(x-1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x-4=0\\x-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}3x-4=0\Rightarrow3x=4\Rightarrow x=\frac{4}{3}\\x-1=0\Rightarrow x=1\end{cases}}\)
Vậy x bằng \(\frac{4}{3}\) và x = 1
\(\left(3x-4\right)\left(x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{4}{3}\\x=1\end{cases}}\)
a. \(3\times2^{2x-1}=24\)
\(\Rightarrow2^{2x-1}=8=2^3\)
\(\Rightarrow2x-1=3\Rightarrow x=2\)