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a.\(\dfrac{17}{60}=\dfrac{17}{60}\)
\(\dfrac{4}{5}=\dfrac{4\times12}{5\times12}=\dfrac{48}{60}\)
b.\(\dfrac{5}{6}=\dfrac{5\times4}{6\times4}=\dfrac{20}{24}\)
\(\dfrac{9}{8}=\dfrac{9\times3}{8\times3}=\dfrac{27}{24}\)
c.\(\dfrac{1}{2}=\dfrac{1\times6}{2\times6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
\(\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
d.\(\dfrac{1}{2}=\dfrac{1\times6}{2\times6}=\dfrac{6}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
\(\dfrac{7}{12}=\dfrac{7}{12}\)
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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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\dfrac{3}{4}=\dfrac{3.9}{4.9}=\dfrac{27}{36}\)
\(\dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)
\(b.\dfrac{5}{6}=\dfrac{5.3}{6.3}=\dfrac{15}{18}\) 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
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#\(N\)
`a, MSC: 12`
`2/3 =`\(\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)
`b, MSC: 36`
\(\dfrac{4}{9}=\dfrac{4\times4}{9\times4}=\dfrac{16}{36}\)
`c, MSC: 35`
\(\dfrac{6}{7}=\dfrac{6\times5}{7\times5}=\dfrac{30}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
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. 1/3+3/4+4/6 b.7/8+5/3+6/12 c.1/2-1/3-1/4
=4/12+9/12+8/12 =21/24+40/24+12/24 =6/12-4/12-3/12
=21/12 =73/24 = -1/12
A)=4/12+3/12+2/12=9/12
đáp số : 9/12
B)=3/24+8/24+2/24=13/24
đáp số : 13/24
C)=6/12+4/12+3/12=13/12
đáp số : 13/12