TN
1
K
Khách
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18 tháng 1
b: \(\dfrac{5}{7}-\dfrac{2}{3}\cdot x=\dfrac{4}{5}\)
=>\(\dfrac{2}{3}x=\dfrac{5}{7}-\dfrac{4}{5}=\dfrac{25-28}{35}=\dfrac{-3}{35}\)
=>\(x=-\dfrac{3}{35}:\dfrac{2}{3}=\dfrac{-3}{35}\cdot\dfrac{3}{2}=-\dfrac{9}{70}\)
c: \(\dfrac{1}{2}x+\dfrac{3}{5}x=-\dfrac{2}{3}\)
=>\(x\left(\dfrac{1}{2}+\dfrac{3}{5}\right)=-\dfrac{2}{3}\)
=>\(x\cdot\dfrac{5+6}{10}=\dfrac{-2}{3}\)
=>\(x\cdot\dfrac{11}{10}=-\dfrac{2}{3}\)
=>\(x=-\dfrac{2}{3}:\dfrac{11}{10}=-\dfrac{2}{3}\cdot\dfrac{10}{11}=\dfrac{-20}{33}\)
d: \(\dfrac{4}{7}\cdot x-x=-\dfrac{9}{14}\)
=>\(\dfrac{-3}{7}\cdot x=\dfrac{-9}{14}\)
=>\(\dfrac{3}{7}\cdot x=\dfrac{9}{14}\)
=>\(x=\dfrac{9}{14}:\dfrac{3}{7}=\dfrac{9}{14}\cdot\dfrac{7}{3}=\dfrac{3}{2}\)
26 tháng 12 2021
\(a.12+2x=6^3:6^2\\ 12+2x=6\\ 2x=12-6\\ 2x=6\\ x=6:2\\ x=3\)
\(b.48:x+17=33\\ 48:x=33-17\\ 48:x=16\\ x=48:16\\ x=3\)
\(c.\left(9x+2\right).5+28=83\\ \left(9x+2\right).5=83-28\\ \left(9x+2\right).5=55\\ 9x+2=55:5\\ 9x+2=11\\ 9x=11-2\\ 9x=9\\ x=9:9\\ x=1\)
\(d.187-2.\left(x+5\right)=125\\ 2.\left(x+5\right)=187-125\\ 2.\left(x+5\right)=62\\ x+5=62:2\\ x+5=31\\ x=31-5\\ x=26\)
9 tháng 1 2022
a: \(\Leftrightarrow-2x=-\dfrac{1}{3}-\dfrac{1}{8}-\dfrac{5}{7}=-\dfrac{197}{168}\)
hay x=197/336
c: \(\Leftrightarrow5x=9+\dfrac{6}{18}-\dfrac{2}{7}=\dfrac{190}{21}\)
hay x=38/21
NN
2
L
19 tháng 5 2022
a) (2x - 3)(6 - 2x) = 0
=> \(\left[{}\begin{matrix}2x-3=0\\6-2x=0\end{matrix}\right.=>\left[{}\begin{matrix}2x=3\\2x=6\end{matrix}\right.=>\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=3\end{matrix}\right.\)
b) \(5\dfrac{4}{7}:x=13=>\dfrac{39}{7}:x=13=>x=\dfrac{39}{7}:13=>x=\dfrac{3}{7}\)
c) \(2x-\dfrac{3}{7}=6\dfrac{2}{7}=>2x-\dfrac{3}{7}=\dfrac{44}{7}=>2x=\dfrac{47}{7}=>x=\dfrac{47}{14}\)
d) \(\dfrac{x}{5}+\dfrac{1}{2}=\dfrac{6}{10}=>\dfrac{x}{5}=\dfrac{6}{10}-\dfrac{1}{2}=>\dfrac{x}{5}=\dfrac{1}{10}=>x.10=5=>x=\dfrac{1}{2}\)
e) \(\dfrac{x+3}{15}=\dfrac{1}{3}=>\left(x+3\right).3=15=>x+3=5=>x=2\)
27 tháng 7 2021
a) Ta có: \(\left(2x-5\right)^3=216\)
\(\Leftrightarrow2x-5=6\)
\(\Leftrightarrow2x=11\)
hay \(x=\dfrac{11}{2}\)
b) Ta có: \(2x-3⋮x+4\)
\(\Leftrightarrow-11⋮x+4\)
\(\Leftrightarrow x+4\in\left\{1;-1;11;-11\right\}\)
hay \(x\in\left\{-3;-5;7;-15\right\}\)
3 tháng 12 2023
Alo, sugeni two wai phem. Si ga no, you woo be the me that nas te, ai gi da
DV
1
LN
2 tháng 2 2019
a) \(\left|2x-5\right|+5=2x\)
\(\left|2x-5\right|=2x-5\)
\(\Rightarrow2x-5>0\Rightarrow x\ge2,5\)
Vậy \(x\inℝ;x\ge2,5\)
b) \(\left|7x+3\right|=66-x\)
Khi \(\left|7x+3\right|=7x+3\)thì \(x\ge\frac{-3}{7}\)
\(\Rightarrow7x+3=66-x\)
\(7x+x=66-3\)
\(8x=63\)
\(x=\frac{63}{8}\)
Vậy \(x=\frac{63}{8}\)
c) \(\left|5x-2\right|\le2\)
Khi \(\left|5x-2\right|=2\Rightarrow\orbr{\begin{cases}x=0\\x=0,8\end{cases}}\)
Khi \(\left|5x-2\right|=1\Rightarrow\orbr{\begin{cases}x=0,6\\x=0,2\end{cases}}\)
Khi \(\left|5x-2\right|=0\Rightarrow x=0,4\)
Vậy \(x\in\left\{0;0,8;0,6;0,2;0,4\right\}\)
13 tháng 10 2021
\(a,\Rightarrow\left(35x+3\right)\cdot19=152\\ \Rightarrow35x+3=8\\ \Rightarrow x=\dfrac{1}{7}\\ b,\Rightarrow3\left(x+7\right)=42\\ \Rightarrow x+7=14\Rightarrow x=7\\ c,\Rightarrow3\left(x+1\right)=48\\ \Rightarrow x+1=16\Rightarrow x=15\\ d,\Rightarrow120-5x+100\cdot2:5=4\cdot15\\ \Rightarrow120-5x+40=60\\ \Rightarrow5x=100\Rightarrow x=20\\ e,\Rightarrow4x-10=30\\ \Rightarrow4x=40\\ \Rightarrow x=10\\ g,\Rightarrow10x+10=70\\ \Rightarrow10x=60\\ \Rightarrow x=6\)
a. -2/3 - 1/3 (2x - 5) = 3/2
1/3 (2x - 5) = -2/3 - 3/2
1/3 (2x - 5) = -13/6
(2x - 5) = -13/6 : 1/3
2x - 5 = -13/2
2x = -13/2 + 5
2x = -3/2
x = -3/2 : 2
x = -3/4
b. x + 6/5x = -22%
x1 + 6/5x = -11/50
x (1 + 6/5) = -11/50
x . 11/5 = -11/50
x = -11/50 : 11/5
x = -1/10