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a) \(\left|-\frac{2}{11}+\frac{3}{22}x\right|-\frac{1}{2}=\frac{5}{7}\)
=> \(\left|-\frac{2}{11}+\frac{3}{22}x\right|=\frac{17}{14}\)
=> \(\orbr{\begin{cases}-\frac{2}{11}+\frac{3}{22}x=\frac{17}{14}\\-\frac{2}{11}+\frac{3}{22}x=-\frac{17}{14}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{215}{21}\\x=-\frac{53}{7}\end{cases}}\)
b) \(-\frac{7}{8}x-5\frac{3}{4}=3\)
=> \(-\frac{7}{8}x-\frac{23}{4}=3\)
=> \(-\frac{7}{8}x=3+\frac{23}{4}=\frac{35}{4}\)
=> \(x=\frac{35}{4}:\left(-\frac{7}{8}\right)=\frac{35}{4}\cdot\left(-\frac{8}{7}\right)=-10\)
c) \(2x+\left(-\frac{2}{7}\right)-7=-11\)
=> \(2x-\frac{2}{7}-7=-11\)
=> \(2x=-11+7+\frac{2}{7}=-\frac{26}{7}\)
=> \(x=\left(-\frac{26}{7}\right):2=-\frac{13}{7}\)
d) \(\frac{3}{7}+x:\frac{14}{15}=\frac{1}{2}\)
=> \(x:\frac{14}{15}=\frac{1}{2}-\frac{3}{7}=\frac{1}{14}\)
=> \(x=\frac{1}{14}\cdot\frac{14}{15}=\frac{1}{15}\)
\(a)\frac{11}{4}-2x=\frac{-1}{2}\)
\(2x=\frac{11}{4}-\left(\frac{-1}{2}\right)\)
\(2x=\frac{11}{4}+\frac{1}{2}\)
\(2x=\frac{11}{4}+\frac{2}{4}\)
\(2x=\frac{13}{4}\)
\(x=\frac{13}{4}:2\)
\(x=\frac{13}{8}\)
\(b)\left|\frac{3}{4}-\frac{1}{2x}\right| +\frac{1}{3}=\frac{5}{6}\)
\(\left|\frac{3}{4}-\frac{1}{2x}\right|=\frac{5}{6}-\frac{1}{3}\)
\(\left|\frac{3}{4}-\frac{1}{2x}\right|=\frac{5}{6}-\frac{2}{6}\)
\(\left|\frac{3}{4}-\frac{1}{2x}\right|=\frac{3}{6}\)
\(TH1:\)
\(\frac{3}{4}-\frac{1}{2x}=\frac{3}{6}\)
\(\frac{1}{2x}=\frac{3}{4}-\frac{3}{6}\)
\(\frac{1}{2x}=\frac{18}{24}-\frac{12}{24}\)
\(\frac{1}{2x}=\frac{6}{24}\)
\(\frac{1}{2x}=\frac{1}{4}\)
\(\Rightarrow2x=4\)
\(x=4:2\)
\(x=2\)
\(TH2:\)
\(\frac{3}{4}-\frac{1}{2x}=\frac{-3}{6}\)
\(\frac{1}{2x}=\frac{3}{4}-\left(\frac{-3}{6}\right)\)
\(\frac{1}{2x}=\frac{3}{4}+\frac{3}{6}\)
\(\frac{1}{2x}=\frac{18}{24}+\frac{12}{24}\)
\(\frac{1}{2x}=\frac{30}{24}\)
\(\frac{1}{2x}=\frac{5}{4}\)
\(\Rightarrow1:2x=5:4\)
\(1:2x=1,25\)
\(2x=1:1,25\)
\(2x=0,8\)
\(x=0,8:2\)
\(\)\(x=0,4\)
Chả biết đúng hay sai. Làm đại vậy.
a)\(\left|2x-6\right|+\left|x+3\right|=8\)
Áp dụng dạng: \(f\left(x\right)=ax+b\Leftrightarrow x=-\frac{b}{a}\) Ta có:
\(\left|2x-6\right|=\left|2x+\left(-6\right)\right|\Leftrightarrow x=\left|-\frac{-6}{2}\right|=3\) (1)
\(\left|x+3\right|=\left|1x+3\right|=\left|-\frac{3}{1}\right|=3\) (2)
Do \(\left(1\right)+\left(2\right)=\left|2x-6\right|+\left|x+3\right|=6\) (3).Nhưng theo giả thiết thì:
\(\left|2x-6\right|+\left|x-3\right|=8\) (4)
Lấy (4) - (3) được 2. Nên suy ra: \(x=3-2=1\)
b) Tương tự bài a . Ta cũng tìm được x = 1
\(\frac{2}{3}+2x=\frac{11}{2}\)
\(\Rightarrow2x=\frac{11}{2}-\frac{2}{3}\)
\(\Rightarrow2x=\frac{33}{6}-\frac{4}{6}\)
\(\Rightarrow2x=\frac{29}{6}\)
\(\Rightarrow x=\frac{29}{12}\)