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\(\dfrac{3}{9}=\dfrac{3:3}{9:3}=\dfrac{1}{3}\)
\(\dfrac{15}{27}=\dfrac{15:3}{27:3}=\dfrac{5}{9}\)
\(\dfrac{28}{20}=\dfrac{28:4}{20:4}=\dfrac{7}{5}\)
\(\dfrac{5}{105}=\dfrac{5:5}{105:5}=\dfrac{1}{21}\)
\(\dfrac{24}{39}=\dfrac{24:3}{39:3}=\dfrac{8}{13}\)
a) \(...=\dfrac{5}{6}-\dfrac{4}{15}=\dfrac{75}{90}-\dfrac{24}{90}=\dfrac{51}{90}\)
b) \(...=\dfrac{1}{2}-\dfrac{1}{5}=\dfrac{5}{10}-\dfrac{2}{10}=\dfrac{3}{10}\)
\(\dfrac{25}{30}\) - \(\dfrac{4}{15}\) = \(\dfrac{5}{6}\) - \(\dfrac{4}{15}\) = \(\dfrac{17}{30}\)
\(\dfrac{27}{54}\) - \(\dfrac{3}{15}\) = \(\dfrac{1}{2}\) - \(\dfrac{1}{5}\) = \(\dfrac{3}{10}\)
Bạn tự QĐMS nhé
\(\dfrac{15}{35}=\dfrac{15:5}{35:5}=\dfrac{3}{7}\)
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
\(\dfrac{17}{50}\) ( phân số dã tối giản )
\(\dfrac{15}{45}=\dfrac{15:3}{45:3}=\dfrac{5}{15}=\dfrac{5:5}{15:5}=\dfrac{1}{3}\)
\(\dfrac{99}{121}=\dfrac{99:11}{121:11}=\dfrac{9}{11}\)
`24/27` chưa được rút gọn nha:'>
\(\dfrac{24}{27}=\dfrac{24:3}{27:3}=\dfrac{8}{9}\)
\(\frac{9}{16}:\frac{27}{8}=\frac{9}{16}\times\frac{8}{27}=\frac{9\times8}{16\times27}=\frac{1\times1}{2\times3}=\frac{1}{6}\)\(\frac{1}{6}\)
\(\frac{40}{7}:\frac{5}{14}=\frac{40}{7}\times\frac{14}{5}=\frac{40\times14}{7\times5}=\frac{8\times2}{1\times1}\)\(=16\)
tk nha bn
\(\frac{27}{36}\)=\(\frac{3}{4}\)
\(\frac{42}{63}\)=\(\frac{6}{9}\)=\(\frac{2}{3}\)
\(\frac{27}{36}=\frac{27:9}{36:9}=\frac{3}{4}\)
\(\frac{42}{63}=\frac{42:21}{63:21}=\frac{2}{3}\)
\(^{\dfrac{27}{20}}\) =\(\dfrac{27:4}{20:4}\) = \(\dfrac{8}{5}\)
=8/5 nha