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2 - 5/6= 7/6
7/8+3/4=`13/8
2/5+3/4=23/20
7/12 - 2/7 + 1/12=8/21
12/17 - 5/17 - 4/17=3/17
Cách 1:
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{5}{6}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{20}{24}\)
\(=\frac{5}{3}\)
Cách 2.
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\left(\frac{5}{12}+\frac{7}{12}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(1-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(\frac{3}{3}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\frac{2}{3}\times\frac{5}{2}\)
\(=\frac{5}{3}\)
Linz
7/12-2/7+1/12=
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\frac{25}{84}+\frac{1}{12}=\frac{8}{21}\)