Đáp án:
$\frac{4}{9}$ + $\frac{3}{7}$ = $\frac{28}{63}$ +$\frac{27}{63}$ = $\frac{55}{63}$
$\frac{3}{4}$ + $\frac{7}{24}$ = $\frac{18}{24}$ + $\frac{7}{24}$ = $\frac{25}{24}$
$\frac{1}{3}$ + $\frac{2}{9}$ + $\frac{4}{27}$ = $\frac{9}{27}$ + $\frac{6}{27}$ + $\frac{4}{27}$ = $\frac{19}{27}$
$\frac{5}{6}$ - $\frac{3}{8}$ = $\frac{20}{24}$ - $\frac{9}{24}$ = $\frac{11}{24}$
$\frac{7}{15}$ - $\frac{11}{30}$ = $\frac{14}{30}$ - $\frac{11}{30}$ = $\frac{3}{30}$ = $\frac{1}{10}$
$\frac{2}{3}$ + $\frac{1}{6}$ - $\frac{7}{12}$ = $\frac{8}{12}$ + $\frac{2}{12}$ - $\frac{7}{12}$ =$\frac{3}{12}$ = $\frac{1}{4}$
$\frac{18}{25}$ × $\frac{15}{6}$ = $\frac{45}{25}$ = $\frac{9}{5}$
$\frac{30}{49}$ : $\frac{6}{7}$ = $\frac{30}{49}$ × $\frac{7}{6}$ = $\frac{5}{7}$
$\frac{1}{2}$ × $\frac{3}{4}$ : $\frac{6}{5}$ = $\frac{1}{2}$ × $\frac{3}{4}$ × $\frac{5}{6}$
= $\frac{5}{16}$
8 × $\frac{5}{3}$ : $\frac{12}{5}$ = $\frac{8}{1}$ × $\frac{5}{3}$ × $\frac{5}{12}$ = $\frac{50}{9}$
4 : $\frac{9}{5}$ : $\frac{10}{3}$ = $\frac{4}{1}$ × $\frac{5}{9}$ × $\frac{3}{10}$ = $\frac{2}{3}$
NO COPY!
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