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5 tháng 8 2022
2: =>2x-1/4=5/6-1/2x
=>5/2x=5/6+1/4=13/12
=>x=13/30
3: =>3x-5/6=2/3-1/2x
=>3,5x=2/3+5/6=4/6+5/6=9/6=3,2
hay x=32/35
MA
24 tháng 8 2016
\(\frac{2}{3}x+\frac{5}{7}=\frac{3}{10}\)
\(\Rightarrow\frac{2}{3}x=\frac{3}{10}-\frac{5}{7}\)
\(\Rightarrow\frac{2}{3}x=-\frac{29}{70}\)
\(\Rightarrow x=-\frac{29}{70}:\frac{2}{3}\)
\(\Rightarrow x=-\frac{87}{140}\)
tíc mình nha
16 tháng 10 2019
b) \(\left(5x-1\right)\left(2x-\frac{1}{3}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}5x-1=0\\2x-\frac{1}{3}=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}5x=1\\2x=\frac{1}{3}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{1}{5}\\x=\frac{1}{6}\end{matrix}\right.\)
DH
16 tháng 10 2019
e, \(-\frac{3}{4}-\left|\frac{4}{5}-x\right|=-1\)
\(\Leftrightarrow\left|\frac{4}{5}-x\right|=-\frac{3}{4}-\left(-1\right)\)
\(\Leftrightarrow\left|\frac{4}{5}-x\right|=\frac{1}{4}\)
\(\Leftrightarrow\left[{}\begin{matrix}\frac{4}{5}-x=\frac{1}{4}\\\frac{4}{5}-x=-\frac{1}{4}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{7}{15}\\x=1,05\end{matrix}\right.\)
Vậy ....
S
28 tháng 6 2019
\(a,\frac{3x+2}{5x+7}=\frac{3x-1}{5x-1}=\frac{\left(3x+2\right)-\left(3x-1\right)}{\left(5x+7\right)-\left(5x-1\right)}=\frac{3}{8};\frac{3x+2}{5x+7}=\frac{3}{8}\Leftrightarrow24x+16=15x+21\Leftrightarrow9x=5\Leftrightarrow x=\frac{5}{9}\) \(b,\frac{37-x}{x+13}=\frac{3}{7}\Leftrightarrow37.7-7x=3x+39\Leftrightarrow259-7x=3x+39\Leftrightarrow220-7x=3x\Leftrightarrow10x=220\Leftrightarrow x=22\) \(c,\frac{x+1}{2x+1}=\frac{0,5x+2}{x+3}=\frac{x+4}{2x+6}=\frac{\left(x+4\right)-\left(x+1\right)}{2x+6-\left(2x+1\right)}=\frac{3}{5};\frac{x+1}{2x+1}=\frac{3}{5}\Leftrightarrow5x+5=6x+3\Leftrightarrow x=2\) \(d,\frac{x-2}{x+2}=\frac{x+3}{x-4}=\frac{\left(x+3\right)-\left(x-2\right)}{\left(x-4\right)-\left(x+2\right)}=\frac{5}{-6};\frac{x-2}{x+2}=\frac{5}{-6}\Leftrightarrow6\left(2-x\right)=5x+10\Leftrightarrow2-6x=5x\Leftrightarrow x=\frac{2}{11}\) \(f,\frac{3x-5}{x}=\frac{9x}{3x+2}=\frac{9x-15}{3x}=\frac{9x-\left(9x-15\right)}{\left(3x+2\right)-3x}=\frac{15}{2};\frac{9x}{3x+2}=\frac{15}{2}\Leftrightarrow18x=45x+30\Leftrightarrow27x+30=0\Leftrightarrow x=\frac{-10}{9}\) \(e,\frac{x+2}{6}=\frac{5x-1}{5}\Leftrightarrow5\left(x+2\right)=6\left(5x-1\right)\Leftrightarrow5x+10=30x-6\Leftrightarrow10=25x-6\Leftrightarrow25x=16\Leftrightarrow x=\frac{16}{25}\)
VM
27 tháng 9 2019
1.
a) \(\left(3\frac{1}{2}-2x\right).1\frac{1}{3}=7\frac{1}{3}\)
\(\Rightarrow\left(\frac{7}{2}-2x\right).\frac{4}{3}=\frac{22}{3}\)
\(\Rightarrow\left(\frac{7}{2}-2x\right)=\frac{22}{3}:\frac{4}{3}\)
\(\Rightarrow\frac{7}{2}-2x=\frac{11}{2}\)
\(\Rightarrow2x=\frac{7}{2}-\frac{11}{2}\)
\(\Rightarrow2x=-2\)
\(\Rightarrow x=\left(-2\right):2\)
\(\Rightarrow x=-1\)
Vậy \(x=-1.\)
b) \(\frac{4}{5}+\frac{1}{5}:x=\frac{1}{6}\)
\(\Rightarrow\frac{1}{5}:x=\frac{1}{6}-\frac{4}{5}\)
\(\Rightarrow\frac{1}{5}:x=-\frac{19}{30}\)
\(\Rightarrow x=\frac{1}{5}:\left(-\frac{19}{30}\right)\)
\(\Rightarrow x=-\frac{6}{19}\)
Vậy \(x=-\frac{6}{19}.\)
Chúc bạn học tốt!
\(3x+\frac{1}{4}=5\frac{1}{3}\)
\(\Rightarrow3x+\frac{1}{4}=\frac{16}{3}\)
\(\Rightarrow3x=\frac{16}{3}-\frac{1}{4}\)
\(\Rightarrow3x=\frac{61}{12}\)
\(\Rightarrow x=\frac{61}{12}:3\)
\(\Rightarrow x=\frac{61}{36}\)
Vậy \(x=\frac{61}{36}.\)
\(3x+\frac{1}{4}=5\frac{1}{3}\)
\(3x+\frac{1}{4}=\frac{16}{3}\)
\(3x=\frac{16}{3}-\frac{1}{4}\)
\(3x=\frac{61}{12}\)
\(x=\frac{61}{12}:3\)
\(x=\frac{61}{36}\)
Học tốt