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1) Ta có : \(\frac{49}{28}=\frac{49:7}{28:7}=\frac{7}{4}\)
\(\frac{85}{51}=\frac{85:17}{51:17}=\frac{5}{3}\)
\(\frac{64}{96}=\frac{64:32}{96:32}=\frac{2}{3}\)
\(\frac{1212}{3030}=\frac{1212:606}{3030:606}=\frac{2}{5}\)
\(\frac{32032}{48048}=\frac{32032:16016}{48048:16016}=\frac{2}{3}\)
\(\frac{1339}{1442}=\frac{1339:103}{1442:103}=\frac{13}{14}\)
Bài 1 :
49/28 =7/4 85/51=5/3 64/96=2/3 1212/3030=2/5 32032/48048=2/3 1339/1442=13/14
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`6/10=3/5`
`70/9=70/9`
`96/72=4/3`
`45/35=9/7`
`24/36=2/3`
`25/100=1/4`
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a: 6/9=2/3
6/24=1/4
48/96=1/2
42/98=3/7
b: 24/36=2/3
18/30=3/5
15/120=1/8
80/240=1/3
c: 5/25=1/5
75/100=3/4
64/720=4/45
16/1000=2/125
Bài 2:
Các phân số bằng 2/3 là 34/51; 20/30; 84/126
Bài 1 :
a) 6/9 = 2/3 ; 6/24 = 1/4 ; 48/96 = 1/2 ; 42/98 = 3/7
b) 24/36 = 2/3 ; 18/30 = 3/5 ; 15/120 = 1/8 ; 80 / 240 = 1/3
c) 5 / 25 = 1/5 ; 75/100=3/4 ; 64/720=4/45 ; 16/1000=2/125
Bài 2 :
Các phân số bằng 2/3 là :
\(\text{34/51; 20/30; 84/126}\)
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Rút gọn các phân số sau 12/30
20/45. 28/70. 34/51
BL:
12/30=6/15
20/45=4/9
28/70=2/5
34/51=2/3
![](https://rs.olm.vn/images/avt/0.png?1311)
Rút gọn các phân số sau về phân số tối giản:
12/30 ................\(=\dfrac{12:6}{30:6}=\dfrac{2}{5}\)...........................................
20/45 ....................\(=\dfrac{20:5}{45:5}=\dfrac{4}{9}\)......................................
28/70.....................\(=\dfrac{28:14}{70:14}=\dfrac{2}{5}\).......................................
Rút gọn các phân số sau về phân số tối giản:
12/30 ..= 6/15........................................................
20/45 ..=4/9........................................................
28/70..=14/5..........................................................
34/51..=2/3..........................................................
215/300..=43/20.....................................................
1200/2010..=120/201.................................................
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\(a,\dfrac{3}{9}=\dfrac{1}{3}\\ \dfrac{16 }{24}=\dfrac{2}{3}\\ b,\dfrac{17}{51}=\dfrac{1}{3}=\dfrac{5}{15}\\ \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{3}{15}\\ c,\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{3}{6}\\ \dfrac{15}{45}=\dfrac{1}{3}=\dfrac{2}{6}\\ d,\dfrac{42}{63}=\dfrac{2}{3}=\dfrac{6}{9}\\ \dfrac{64}{72}=\dfrac{8}{9}\)
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\(=\dfrac{3}{5}\\ =\dfrac{7}{9}\\ =\dfrac{4}{3}\\ =\dfrac{9}{7}\)
\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\dfrac{96}{72}=\dfrac{8}{9};\dfrac{45}{35}=\dfrac{9}{7}\)
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\(\dfrac{5}{15}=\dfrac{5:5}{15:5}=\dfrac{1}{3}\\ \dfrac{28}{56}=\dfrac{28:28}{56:28}=\dfrac{1}{2}\\ \dfrac{48}{96}=\dfrac{48:48}{96:48}=\dfrac{1}{2}\\ \dfrac{15}{120}=\dfrac{15:15}{120:15}=\dfrac{1}{8}\\ \dfrac{60}{80}=\dfrac{60:20}{80:20}=\dfrac{3}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\)\(\dfrac{96}{72}=\dfrac{4}{3}\)\(\dfrac{45}{35}=\dfrac{9}{7}\)
\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\dfrac{96}{72}=\dfrac{4}{3};\dfrac{45}{35}=\dfrac{9}{7}\)
\(\frac{16}{24}=\frac{2}{3}\)
\(\frac{35}{45}=\frac{7}{9}\)
\(\frac{49}{28}=\frac{7}{4}\)
\(\frac{85}{51}=\frac{5}{3}\)
\(\frac{64}{96}=\frac{2}{3}\)
16/24=2/3
35/45=7/9
49/28=9/4
85/51=5/3
64/96=2/3