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a: 5/6=25/30
9/30=9/30
b: 7/8=49/56
5/7=40/56
c: 2/9=4/18
5/18=5/18
d: 3/10=6/20
1/4=5/20
5/6=25/30
9/30=9/30
7/8=49/56
5/7=40/56
2/9=4/18
5/18=5/18
3/10=6/20
1/4=5/20
\(a,\dfrac{1}{4},\dfrac{5}{6}và\dfrac{7}{12}\)
\(\dfrac{1}{4}=\dfrac{1\times3}{4\times3}=\dfrac{3}{12};\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12};\dfrac{7}{12}\)
\(b,\dfrac{1}{9},\dfrac{3}{5},\dfrac{11}{45}\)
\(\dfrac{1}{9}=\dfrac{1\times5}{9\times5}=\dfrac{5}{45};\dfrac{3}{5}=\dfrac{3\times9}{5\times9}=\dfrac{27}{45};\dfrac{11}{45}\)
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) \(\dfrac{4}{7}và\dfrac{5}{6}\)⇔ \(\dfrac{24}{42}và\dfrac{35}{42}\)
b) \(\dfrac{5}{14}và\dfrac{3}{8}\)⇔ \(\dfrac{20}{56}và\dfrac{21}{56}\)
c) \(\dfrac{9}{10}và\dfrac{7}{5}\)⇔ \(\dfrac{9}{10}và\dfrac{14}{10}\)
d) \(\dfrac{3}{5};\dfrac{5}{6}và\dfrac{7}{30}\)⇔ \(\dfrac{18}{30};\dfrac{25}{30}và\dfrac{7}{30}\)
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
Bài 2:
a: 1/3=20/60
1/5=12/60
1/12=5/60
b: 1/3=16/48
1/12=4/48
1/48=1/48
\(a.\dfrac{3}{4}=\dfrac{3.9}{4.9}=\dfrac{27}{36}\)
\(\dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)
\(b.\dfrac{5}{6}=\dfrac{5.3}{6.3}=\dfrac{15}{18}\) giữ nguyên phân số còn lại
c. \(\dfrac{3}{8}=\dfrac{3.3}{8.3}=\dfrac{9}{24}\)
\(\dfrac{7}{12}=\dfrac{7.2}{12.2}=\dfrac{14}{24}\)
d. \(\dfrac{11}{12}=\dfrac{11.4}{12.4}=\dfrac{44}{48}\)
giữ nguyên phân số còn lại.
e. \(\dfrac{9}{50}=\dfrac{9.4}{50.4}=\dfrac{36}{200}\)
giữ nguyên phân số còn lại
\(f.\dfrac{1}{3}=\dfrac{1.3}{15.3}=\dfrac{3}{45}\)
\(\dfrac{2}{15}=\dfrac{2.3}{15.3}=\dfrac{6}{45}\)
giữ nguyên phân số còn lại
a)12/21 và 3/21
b)12/36 và 15/36
c)63/56 và 48/56
Chúc bạn học tốt
A, \(\dfrac{7}{9}\) = \(\dfrac{7\cdot5}{9\cdot5}\) = \(\dfrac{35}{45}\) \(\dfrac{3}{5}\) = \(\dfrac{3\cdot9}{5\cdot9}\) = \(\dfrac{27}{45}\)
Vậy \(\dfrac{7}{9}\) > \(\dfrac{3}{5}\)
B, \(\dfrac{3}{4}\) = \(\dfrac{3\cdot6}{4\cdot6}\) = \(\dfrac{18}{24}\) \(\dfrac{5}{6}\) = \(\dfrac{5\cdot4}{6\cdot4}\) = \(\dfrac{20}{24}\)
Vậy \(\dfrac{3}{4}\) < \(\dfrac{5}{6}\)
C, \(\dfrac{1}{4}\) = \(\dfrac{1\cdot3}{4\cdot3}\) = \(\dfrac{3}{12}\) \(\dfrac{2}{3}\) = \(\dfrac{2\cdot4}{3\cdot4}\) = \(\dfrac{8}{12}\)
Vậy \(\dfrac{1}{4}\) < \(\dfrac{2}{3}\)
D, \(\dfrac{8}{9}\) = \(\dfrac{8\cdot2}{9\cdot2}\) = \(\dfrac{16}{18}\) \(\dfrac{1}{2}\) = \(\dfrac{1\cdot9}{2\cdot9}\) = \(\dfrac{9}{18}\)
Vậy \(\dfrac{8}{9}\) > \(\dfrac{1}{2}\)
\(\cdot\) là dấu nhân