Bài 3:
a: \(-\dfrac{109}{111}=1-\dfrac{2}{111}\)
\(-\dfrac{205}{207}=1-\dfrac{2}{207}\)
mà 2/111>2/207
nên -109/111<-205/207
Bài 2:
a: \(\Leftrightarrow x+\dfrac{5}{21}+\dfrac{1}{7}=\dfrac{7}{3}\)
hay x=41/21
b: \(\Leftrightarrow x\cdot\dfrac{-1}{5}-x\cdot\dfrac{1}{10}=\dfrac{5}{6}+\dfrac{2}{3}=\dfrac{9}{6}=\dfrac{3}{2}\)
=>x=-5
c: \(\Leftrightarrow x-\dfrac{1}{4}\in\left\{\dfrac{6}{5};-\dfrac{6}{5}\right\}\)
hay \(x\in\left\{\dfrac{29}{20};-\dfrac{19}{20}\right\}\)
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