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a) \(\dfrac{1}{3}=\dfrac{1.8}{3.8}=\dfrac{8}{24}\)
\(\dfrac{3}{4}=\dfrac{3.6}{4.6}=\dfrac{18}{24}\)
\(\dfrac{5}{8}=\dfrac{5.3}{8.3}=\dfrac{15}{24}\)
b) \(\dfrac{2}{3}=\dfrac{2.4}{3.4}=\dfrac{8}{12}\)
\(\dfrac{3}{4}=\dfrac{3.3}{4.3}=\dfrac{9}{12}\)
\(\dfrac{7}{12}=\dfrac{7}{12}\)
c) \(\dfrac{1}{5}=\dfrac{1.6}{5.6}=\dfrac{6}{30}\)
\(\dfrac{1}{6}=\dfrac{1.5}{6.5}=\dfrac{5}{30}\)
\(\dfrac{1}{30}=\dfrac{1}{30}\)
a ) \(\frac{4}{3}\)= \(\frac{4\times5}{3\times5}\)= \(\frac{20}{15}\)
\(\frac{3}{5}\)= \(\frac{3\times3}{5\times3}\)= \(\frac{9}{15}\)
b) \(\frac{6}{4}\)= \(\frac{6\times7}{4\times7}\)= \(\frac{42}{28}\)
\(\frac{7}{28}\)= \(\frac{7}{28}\)
c) \(\frac{5}{12}\)= \(\frac{5\times4}{12\times4}\)=\(\frac{20}{48}\)
\(\frac{11}{16}\)= \(\frac{11\times3}{16\times3}\)= \(\frac{33}{48}\)
d) \(\frac{2}{5}\)= \(\frac{2\times8}{5\times8}\)= \(\frac{16}{40}\)
\(\frac{1}{4}\)= \(\frac{1\times10}{4\times10}\)= \(\frac{10}{40}\)
\(\frac{3}{8}\)= \(\frac{3\times5}{8\times5}\)= \(\frac{15}{40}\)
gọi
\(\dfrac{12}{39}=\dfrac{x}{12}=\dfrac{36}{y}\)
có `12/39=x/12`
`=> 12xx12=39x`
`=> 39x=144`
`=> x=48/13`
`12/39=36/y`
`=> 36/117=36/y`
`=> y=117`
`
\(\frac{2}{5}< \frac{ }{ }< \frac{4}{7}=\frac{14}{35}< \frac{ }{ }< \frac{20}{35}\)
vậy ta có các p/s là:15/35;16/35;17/35;18/35;19/35