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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) \(\frac{3}{7}+x:\frac{14}{15}=\frac{1}{2}\)
=> \(x:\frac{14}{15}=\frac{1}{2}-\frac{3}{7}=\frac{1}{14}\)
=> \(x=\frac{1}{14}\cdot\frac{14}{15}=\frac{1}{15}\)
\(\left(\frac{3}{5}+\frac{17}{3}\right):\frac{121}{19}+\left(\frac{-17}{3}+\frac{2}{5}\right):\frac{121}{19}\)
\(=\left(\frac{3}{5}+\frac{17}{3}\right).\frac{19}{121}+\left(\frac{-17}{3}+\frac{2}{5}\right).\frac{19}{121}\)
\(=\frac{19}{121}.\left[\left(\frac{3}{5}+\frac{17}{3}\right)+\left(\frac{-17}{3}+\frac{2}{5}\right)\right]\)
\(=\frac{19}{121}.\left[\frac{3}{5}+\frac{17}{3}+\left(\frac{-17}{3}\right)+\frac{2}{5}\right]\)
\(=\frac{19}{121}.\left[\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{-17}{3}+\frac{17}{3}\right)\right]\)
\(=\frac{19}{121}.\left[1+0\right]\)
\(=\frac{19}{121}.1\)
\(=\frac{19}{121}\)
A = \(\frac{4\left(\frac{1}{78}-\frac{1}{60}-\frac{1}{306}\right)}{9\left(\frac{1}{78}-\frac{1}{60}-\frac{1}{306}\right)}:\frac{1+\frac{2}{71}-\frac{5}{121}}{-13\left(1+\frac{2}{71}-\frac{5}{121}\right)}=\frac{4}{9}:-\frac{1}{13}\)
Đoán thôi
(22x+3)2=121
<=>(22x+3)2=112
<=>22x+3=11
<=>22x=11-3
<=>22x=8
<=>x=8:22
<=>x=\(\frac{4}{11}\)
vậy x=\(\frac{4}{11}\)
k mk nha nếu thấy đúng