TL :
\(1\frac{2}{5}\)+ \(2\frac{1}{4}\)= \(\frac{7}{5}\)+ \(\frac{7}{4}\)= \(\frac{45}{20}\)= \(\frac{9}{5}\)
\(3\frac{5}{6}\)+ \(1\frac{2}{3}\)= \(\frac{23}{6}\)+ \(\frac{5}{3}\)= \(\frac{33}{6}\)= \(\frac{11}{2}\)
\(1\frac{3}{4}\)x \(2\frac{1}{3}\)= \(\frac{7}{4}\)+ \(\frac{7}{3}\)= \(\frac{38}{12}\)= \(\frac{19}{6}\)
\(2\frac{2}{5}\): \(1\frac{1}{7}\)= \(\frac{12}{5}\): \(\frac{9}{7}\)= \(\frac{84}{45}\)= \(\frac{28}{15}\)
bài này mik cần gấp