1.
2 $\frac{3}{5}$ = $\frac{13}{5}$
5 $\frac{4}{9}$ =$\frac{49}{9}$
2.
a) 3 $\frac{9}{10}$ > 2 $\frac{9}{10}$
b) 3 $\frac{4}{10}$ = 3 $\frac{2}{5}$
3.
a) 1 $\frac{1}{2}$ + 1 $\frac{1}{3}$ = $\frac{3}{2}$ + $\frac{4}{3}$ = $\frac{17}{6}$
b) 2 $\frac{2}{3}$ - 1 $\frac{4}{7}$ = $\frac{8}{3}$ - $\frac{11}{7}$ = $\frac{23}{21}$
c) 2 $\frac{2}{3}$ x 5 $\frac{1}{4}$ = $\frac{8}{3}$ x $\frac{21}{4}$ = 14
d) 3 $\frac{1}{2}$ : 2 $\frac{1}{4}$ = $\frac{7}{2}$ : $\frac{9}{4}$ = $\frac{14}{9}$
4.
Đáp án: C