Bài 1 :
\(a,\dfrac{7}{5}và\dfrac{2}{3}\)
\(\dfrac{7}{5}=\dfrac{7\times3}{5\times3}=\dfrac{21}{15};\dfrac{2}{3}=\dfrac{2\times5}{3\times5}=\dfrac{10}{15}\)
\(b,\dfrac{9}{5}và\dfrac{8}{7}\)
\(\dfrac{9}{5}=\dfrac{9\times7}{5\times7}=\dfrac{63}{35};\dfrac{8}{7}=\dfrac{8\times5}{7\times5}=\dfrac{40}{35}\)
\(c,\dfrac{11}{15}và\dfrac{9}{10}\)
\(\dfrac{11}{15}=\dfrac{11\times2}{15\times2}=\dfrac{22}{30};\dfrac{9}{10}=\dfrac{9\times3}{10\times3}=\dfrac{27}{30}\)
Bài 2 :
\(a,\dfrac{8}{15}và\dfrac{7}{20}\)
\(\dfrac{8}{15}=\dfrac{8\times4}{15\times4}=\dfrac{32}{60};\dfrac{7}{20}=\dfrac{7\times3}{20\times3}=\dfrac{21}{60}\)
\(b,\dfrac{5}{18}và\dfrac{8}{27}\)
\(\dfrac{5}{18}=\dfrac{5\times3}{18\times3}=\dfrac{15}{54};\dfrac{8}{27}=\dfrac{8\times2}{27\times2}=\dfrac{16}{54}\)
\(c,\dfrac{10}{24}và\dfrac{9}{16}\)
\(\dfrac{10}{24}=\dfrac{10\times2}{24\times2}=\dfrac{20}{48};\dfrac{9}{16}=\dfrac{9\times3}{16\times3}=\dfrac{27}{48}\)
Đây là tác hại khi bn nghỉ tết sung quá ko khác gì mik hihi
