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3/4 : 5/6 và 4/9 ( MC = 36 )
3/4 = 27/36
5/6 = 30/36
4/9 = 16/36.
\(\dfrac{3}{4}\);\(\dfrac{5}{6}\)và \(\dfrac{4}{9}\).
\(\dfrac{3}{4}\)=\(\dfrac{27}{36}\);\(\dfrac{5}{6}\)=\(\dfrac{30}{36}\) và \(\dfrac{4}{9}\)=\(\dfrac{16}{36}\)
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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
\(\frac{5}{6}=\frac{5}{6};\frac{1}{3}=\frac{3}{6}\)
\(\frac{1}{4}=\frac{10}{40};\frac{9}{10}=\frac{36}{40}\)
a: 2/3=10/15
1/5=3/15
b: 3/4=6/8
5/8=5/8
c: 5/6=15/18
4/9=8/18
a, 9/4=9x5/4x5=45/20 7/5=7x4/5x4=28/20
9/4=9x7/4x7=63/28 5/7=5x4/7x4=20/28
b, 3/4=3x6/4x6=18/24 9/24
7/5=7x2/5x2=14/10 6/10
\(\dfrac{3}{4}=\dfrac{3\cdot9}{4\cdot9}=\dfrac{27}{36}\)
\(\dfrac{5}{6}=\dfrac{5\cdot6}{6\cdot6}=\dfrac{30}{36}\)
\(\dfrac{4}{9}=\dfrac{4\cdot4}{9\cdot4}=\dfrac{16}{36}\)