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\(1,\frac{3}{5}\&\frac{1}{2}\)
\(+,\frac{3}{5}=\frac{3.2}{5.2}=\frac{6}{10}\)
\(+,\frac{1}{2}=\frac{1.5}{2.5}=\frac{5}{10}\)
\(2,\frac{4}{7}\&\frac{9}{14}\)
\(+,\frac{4}{7}=\frac{4.2}{7.2}=\frac{8}{14}\)
\(+,\frac{9}{14}=\frac{9}{14}\)
\(3,\frac{2}{3}\&\frac{3}{5}\)
\(+,\frac{2}{3}=\frac{2.5}{3.5}=\frac{10}{15}\)
\(+,\frac{3}{5}=\frac{3.3}{5.3}=\frac{9}{15}\)
\(1,\\ \dfrac{3}{5}=\dfrac{21}{35};\dfrac{4}{7}=\dfrac{20}{35}\\ \dfrac{2}{3}=\dfrac{4}{6};\dfrac{5}{6}=\dfrac{5}{6}\\ \dfrac{4}{9}=\dfrac{8}{18};\dfrac{1}{6}=\dfrac{3}{18}\\ 2,\\ \dfrac{5}{9}=\dfrac{10}{18};\dfrac{7}{8}=\dfrac{14}{16};\dfrac{24}{42}=\dfrac{12}{21}\)
1. \(\dfrac{3}{5}=\dfrac{21}{35};\dfrac{4}{7}=\dfrac{20}{35}\)
\(\dfrac{2}{3}=\dfrac{4}{6};\dfrac{5}{6}=\dfrac{5}{6}\)
\(\dfrac{4}{9}=\dfrac{16}{36};\dfrac{1}{6}=\dfrac{6}{36}\)
2. \(\dfrac{5}{9}=\dfrac{10}{18}\)
\(\dfrac{7}{8}=\dfrac{14}{16}\)
\(\dfrac{24}{42}=\dfrac{12}{21}\)
a)1/2=6/12;2/3=8/12;5/6=10/12;giữ nguyên phan số 7/12
b)5/6=60/72;4/9=32/72;7/24=21/72
c)3/4=45/60;5/12=25/60;2/3=40/60;7/15=28/60
\(\frac{5}{3}=\frac{5\cdot4}{3\cdot4}=\frac{20}{12};\frac{1}{4}=\frac{1\cdot3}{4\cdot3}=\frac{3}{12}\)
\(\frac{3}{8}=\frac{3\cdot3}{8\cdot3}=\frac{9}{24};\frac{7}{24}\)
\(\frac{1}{2}=\frac{1\cdot15}{2\cdot15}=\frac{15}{30};\frac{2}{3}=\frac{2\cdot10}{3\cdot10}=\frac{20}{30};\frac{3}{5}=\frac{3\cdot6}{5\cdot6}=\frac{18}{30}\)
\(\frac{4}{5}\)và \(\frac{7}{9}\)
\(\frac{4}{5}=\frac{4\times9}{5\times9}=\frac{36}{45}\)
\(\frac{7}{9}=\frac{7\times5}{9\times5}=\frac{35}{45}\)
\(\frac{2}{3}\)và \(\frac{5}{12}\) ( MSC: 12)
\(\frac{2}{3}=\frac{2\times4}{3\times4}=\frac{8}{12}\)
Giữ nguyên phân số \(\frac{5}{12}\)
