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a.\(\frac{15}{8}=\frac{45}{24}\) b.\(\frac{8}{11}=\frac{224}{308}\)
\(\frac{7}{21}=\frac{1}{3}=\frac{8}{24}\) \(\frac{9}{7}=\frac{396}{308}\)
\(\frac{19}{6}=\frac{76}{24}\) \(\frac{5}{4}=\frac{385}{308}\)
a: \(\dfrac{11}{42}=\dfrac{11\cdot1}{42\cdot1}=\dfrac{11}{42}\)
\(\dfrac{5}{6}=\dfrac{5\cdot7}{6\cdot7}=\dfrac{35}{42}\)
b: \(\dfrac{40}{7}=\dfrac{40\cdot4}{7\cdot4}=\dfrac{160}{28}\)
\(\dfrac{10}{28}=\dfrac{10\cdot1}{28\cdot1}=\dfrac{10}{28}\)
c: \(\dfrac{4}{15}=\dfrac{4\cdot4}{15\cdot4}=\dfrac{16}{60}\)
\(\dfrac{14}{60}=\dfrac{14\cdot1}{60\cdot1}=\dfrac{14}{60}\)
a)\(\dfrac{11}{42}=\dfrac{35}{42}\)
b) \(\dfrac{160}{28}=\dfrac{10}{28}\)
c) \(\dfrac{16}{60}=\dfrac{14}{60}\)
`a,MSC:45`
`7/9=(7xx5)/(9xx5)=35/45`
`2/5=(2xx9)/(5xx9)=18/35`
`b,MSC:21`
`6/7=(6xx3)/(7xx3)=18/21`
`17/21` giữ nguyên
`c,MSC:36`
`2/3=(2xx12)/(3xx12)=24/36`
`1/4=(1xx9)/(4xx9)=9/36`
`5/9=(5xx4)/(9xx4)=20/36`
a, 45/24 ; 8/24 ; 76/24
b,
\(\frac{15}{8};\frac{7}{21};\frac{19}{6_{ }}\)
Mẫu số chung là 168
\(\frac{15}{8}=\frac{15x21}{8x21}=\frac{315}{168}\) \(\frac{7}{21}=\frac{7x8}{21x8}=\frac{56}{168}\)
\(\frac{19}{6}=\frac{19x28}{6x28}=\frac{532}{168}\)
b) \(\frac{8}{11};\frac{9}{7};\frac{5}{4}\)
\(\frac{8}{11}=\frac{8x7x4}{11x7x4}=\frac{224}{308}\) \(\frac{9}{7}=\frac{9x11x4}{7x11x4}=\frac{396}{308}\)
\(\frac{5}{4}=\frac{5x11x7}{4x11x7}=\frac{385}{308}\)