Đáp án:
Giải thích các bước giải:
a, $\frac{1}{4}$ : $\frac{1}{5}$ × $\frac{1}{2}$
= $\frac{5}{4}$ × $\frac{1}{2}$
= $\frac{5}{8}$
b, $\frac{2}{6}$ × $\frac{3}{7}$ : $\frac{3}{4}$
= $\frac{1}{7}$ × $\frac{3}{4}$
= $\frac{3}{28}$
c, 2$\frac{3}{5}$ : 2$\frac{1}{4}$ + $\frac{5}{2}$
= $\frac{13}{5}$ : $\frac{9}{4}$ + $\frac{5}{2}$
= $\frac{52}{45}$ + $\frac{5}{2}$
= $\frac{26}{9}$
d, $\frac{16}{6}$ - 2$\frac{1}{6}$ : 1$\frac{1}{7}$
= $\frac{16}{6}$ - $\frac{13}{6}$ : $\frac{8}{7}$
= $\frac{16}{6}$ - $\frac{91}{48}$
= $\frac{37}{48}$
e, 3$\frac{2}{5}$ × 1$\frac{4}{7}$ + $\frac{12}{25}$
= $\frac{17}{5}$ × $\frac{11}{7}$ + $\frac{12}{25}$
= $\frac{187}{35}$ + $\frac{12}{25}$
= $\frac{1019}{175}$
g, $\frac{14}{3}$ - 1$\frac{5}{9}$ × 2$\frac{1}{4}$
= $\frac{14}{3}$ - $\frac{14}{9}$ × $\frac{9}{4}$
= $\frac{14}{3}$ - $\frac{7}{2}$
= $\frac{7}{6}$
