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bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
a)\(\frac{2}{3}=\frac{2\times20}{3\times20}=\frac{40}{60}\)
\(\frac{1}{4}=\frac{1\times15}{4\times15}=\frac{15}{60}\)
\(\frac{3}{5}=\frac{3\times12}{5\times12}=\frac{36}{60}\)
b)\(\frac{1}{6}=\frac{1\times55}{6\times55}=\frac{55}{330}\)
\(\frac{2}{5}=\frac{2\times66}{5\times66}=\frac{132}{330}\)
\(\frac{3}{11}=\frac{3\times30}{11\times30}=\frac{90}{330}\)
\(\frac{2}{3}=\frac{2\times20}{3\times20}=\frac{40}{60}\)
\(\frac{3}{4}=\frac{3\times15}{4\times15}=\frac{45}{60}\)
\(\frac{4}{5}=\frac{4\times12}{5\times12}=\frac{48}{60}\)
2/3=2*4*5/3*4*5=20/60
3/43*3*5/3*4*5=45\60
4/5=4*3*5/3*4*5=60/60