\(19\frac{5}{8}\): \(\frac{7}{12}\)- \(15\frac{1}{4}\): \(\frac{7}{12}\)
\(\frac{2}{5}\). \(\frac{1}{3}\)-\(\frac{2}{15}\): \(\frac{1}{5}\)+\(\frac{3}{5}\). \(\frac{1}{3}\)
\(\frac{4}{9}\). \(19\frac{1}{3}\)- \(\frac{4}{9}\). \(39\frac{1}{3}\)
tính hợp lí .giúp mk với ạ.cảm ơn mọi người nhiều
\(19\frac{5}{8}:\frac{7}{12}-15\frac{1}{4}:\frac{7}{12}\)
\(=\frac{157}{8}:\frac{7}{12}-\frac{61}{4}:\frac{7}{12}\)
\(=\frac{157}{8}:\frac{7}{12}-\frac{122}{8}:\frac{7}{12}\)
\(=\left(\frac{157}{8}-\frac{122}{8}\right):\frac{7}{12}\)
\(=\frac{35}{8}:\frac{7}{12}\)
\(=\frac{35}{8}.\frac{12}{7}\)
\(=\frac{5}{2}.\frac{3}{1}\)
\(=\frac{15}{2}\)