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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.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
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Bài 3 :
a: \(MSC:12\\ \dfrac{4}{3}=\dfrac{4\times4}{3\times4}=\dfrac{16}{12};\dfrac{3}{4}=\dfrac{3\times3}{3\times4}=\dfrac{9}{12}\)
b: \(MSC:12\\ \dfrac{5}{4}=\dfrac{5\times3}{4\times3}=\dfrac{15}{12};\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12}\)
c:\(MSC:24\\ \dfrac{3}{8}=\dfrac{3\times3}{8\times3}=\dfrac{9}{24};\dfrac{1}{6}=\dfrac{1\times2}{6\times2}=\dfrac{2}{12}\)
d: \(MSC:35\\ \dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{35};\dfrac{4}{7}=\dfrac{4\times5}{7\times5}=\dfrac{20}{35}\)
Bài 3:
a: 4/3=16/12
3/4=9/12
b: 5/4=30/24
5/6=20/24
c: 3/8=18/48
1/6=8/48
d: 2/5=14/35
4/7=20/35
Bài 4:
a: 7/12=28/48
5/48=5/48
b: 4/100=4/100
8/25=32/100
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a. 1/4 và 2/5 có mẫu số chung là 20.
1/4 = 1 x 5/4 x 5 = 5/20
2/5 = 2 x 4/5 x 4 = 8/20
(Mình gửi tạm câu a trước nhé, mấy câu sau chờ mình tý)
\(\frac{1}{4}\)và\(\frac{2}{5}\)
\(MSC:20\)
\(\frac{1}{4}=\frac{5}{20}\);\(\frac{2}{5}=\frac{8}{20}\)
\(\frac{2}{3}\)và\(\frac{7}{8}\)
\(MSC:24\)
\(\frac{2}{3}=\frac{16}{24};\frac{7}{8}=\frac{21}{24}\)
\(\frac{3}{4}\)và\(\frac{5}{6}\)
\(MSC:24\)
\(\frac{3}{4}=\frac{18}{24};\frac{5}{6}=\frac{20}{24}\)
\(\frac{1}{3}\)và\(\frac{7}{9}\)
\(MSC:27\)
\(\frac{1}{3}=\frac{9}{27};\frac{7}{9}=\frac{21}{27}\)
\(\frac{3}{4}\)và\(\frac{9}{24}\)
\(MSC:96\)
\(\frac{3}{4}=\frac{72}{96};\frac{9}{24}=\frac{36}{96}\)
\(\frac{7}{10}\)và\(\frac{19}{30}\)
\(MSC:300\)
\(\frac{7}{10}=\frac{210}{300};\frac{19}{30}=\frac{190}{300}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: 5/4<7/4
b: 2/3=34/51
9/17=27/51
mà 34>27
nên 2/3>9/17
Bài 3:
a: 1/3+3/8=8/24+9/24=17/24
b: 7/6+5/18=21/18+5/18=26/18=13/9
5/3=20/12 và 1/4=3/12
3/8=9/24 và 7/24
1/2=15/30 ; 2/3=20/30 và 18/30
tk minh nha
5/3=20/12, 1/4=3/12
3/8=9/24, 7/24=giu nguyen
[MSC 30]1/2=15/30, 2/3=20/30, 3/5=18/30