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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) \(\dfrac{1}{5}=\dfrac{1.6}{5.6}=\dfrac{6}{30}\)
\(\dfrac{1}{6}=\dfrac{1.5}{6.5}=\dfrac{5}{30}\)
\(\dfrac{1}{30}=\dfrac{1}{30}\)
\(\dfrac{5}{12}=\dfrac{5\times2}{12\times2}=\dfrac{10}{24};\dfrac{7}{24}\)
a: \(MSC:24\\ \dfrac{1}{3}=\dfrac{1\times8}{3\times8}=\dfrac{8}{24};\dfrac{1}{4}=\dfrac{1\times6}{4\times6}=\dfrac{6}{24}\)
b: \(MSC:24\\ \dfrac{5}{12}=\dfrac{5\times2}{12\times2}=\dfrac{10}{24};\dfrac{7}{6}=\dfrac{7\times4}{6\times4}=\dfrac{28}{24}\)
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
TL
\(MSC:72\)
\(\frac{1}{9}=\frac{8}{72}\) \(\frac{1}{6}=\frac{12}{72}\) \(\frac{3}{8}=\frac{27}{72}\)
HT
\(\frac{3}{5}=\frac{24}{40};\frac{3}{8}=\frac{15}{40};\frac{3}{10}=\frac{12}{40};\frac{3}{2}=\frac{60}{40}\)
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
Ta có MSC=24
\(\dfrac{7}{2}=\dfrac{7\times12}{2\times12}=\dfrac{84}{24}\)
\(\dfrac{3}{4}=\dfrac{3\times6}{4\times6}=\dfrac{18}{24}\)
Giữ nguyên PS \(\dfrac{15}{24}\)
-5/4 =-30/24
7/6 = 28/24
3/8 = 9/24
15/24 giữ nguyên