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a) \(\frac{3}{4}+\frac{1}{4}:x=-3\)
\(\frac{1}{4}:x=-3-\frac{3}{4}\)
\(\frac{1}{4}:x=\frac{-15}{4}\)
\(x=\frac{1}{4}:\frac{-15}{4}\)
\(x=\frac{-1}{15}\)
b) \(x-\frac{1}{2}=2,5-x\)
\(x+x=2,5+\frac{1}{2}\)
\(2x=3\)
\(x=\frac{3}{2}\)
c) \(\left(x+\frac{1}{10}\right)+\left(x+\frac{1}{11}\right)=0\)
\(2x+\frac{21}{110}=0\)
\(2x=\frac{-21}{110}\)
\(x=\frac{-21}{110}:2\)
\(x=\frac{-21}{220}\)
\(\frac{1}{1}\)x 2 x 3 + \(\frac{1}{2}\)x 3 x 4 + \(\frac{1}{3}\)x 4 x 5 + \(\frac{1}{4}\)x 5 x 6
= 1 x 2 + \(\frac{1}{2}\)+ \(\frac{1}{3}\)+ \(\frac{1}{4}\)x 6
= 2 +\(\frac{1}{2}\)+ \(\frac{1}{3}\)+ 1, 5
=
1,
\(\frac{25}{12}+\left(\frac{-4}{12}\right)=\frac{7}{4}\)
\(\frac{-10}{8}+\frac{15}{4}=\frac{5}{2}\)
\(\frac{3}{8}+\frac{-14}{6}=\frac{-47}{24}\)
\(\frac{350}{150}+\left(\frac{-200}{360}\right)=\frac{16}{9}\)
\([\frac{5}{8}+\left(\frac{-3}{4}\right)]+\frac{15}{6}=\frac{-1}{8}+\frac{15}{6}=\frac{19}{8}\)
\(\frac{7}{3}+[\left(\frac{-5}{6}\right)+\left(\frac{-2}{3}\right)]=\frac{7}{3}+\left(\frac{-3}{2}\right)=\frac{5}{6}\)
(-3/4+2/3);5/11+(-1/4+1/3):5/11
=-1/12:5/11+1/12:5/11
=(-1/12:+1/12):5/11
=0:5/11=0