a, $\frac{12}{11}$ : 4
= $\frac{12}{11}$ × $\frac{1}{4}$
= $\frac{3}{11}$
b, $\frac{7}{2}$ - $\frac{4}{7}$ × $\frac{15}{8}$
= $\frac{7}{2}$ - $\frac{15}{14}$
= $\frac{49}{14}$ - $\frac{15}{14}$
= $\frac{34}{14}$
= $\frac{17}{7}$
c, 4 : $\frac{3}{2}$ + $\frac{2}{9}$
= 4 . $\frac{2}{3}$ + $\frac{2}{9}$
= $\frac{8}{3}$ + $\frac{2}{9}$
= $\frac{24}{9}$ + $\frac{2}{9}$
= $\frac{26}{9}$
HỌC TỐT NHA !
#NOCOPY