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3/11 x 2 = 6/11
6/11 : 3/11 = 2
6/11 : 2 = 3/11
2/3 x 11 = 22/3
4/2 x 7 = 14
8/7 : 2/7 = 4
8/7 : 4 = 2/7
2/7 x 4 = 8/7
![](https://rs.olm.vn/images/avt/0.png?1311)
a: 7/8<8/9<9/10<10/11<11/12
b: 4/5<5/6<6/7<7/8
c: 1/3<3/5<7/9<9/11<11/13
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{1}+\dfrac{12}{56}=\dfrac{112+12}{56}=\dfrac{122}{56}=\dfrac{61}{28}\)
\(\left(\dfrac{8+7}{15}\right):\dfrac{2}{11}\)
\(1:\)\(\dfrac{2}{11}\)
\(\dfrac{11}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5/11 + 4/7 + 6/11 + 10/7 = (5/11 + 6/11) + (4/7 + 10/7)
= 1 + 2 = 3
b) 15/9 + 5/8 - 5/9 + 11/8 = (15/9 - 5/9) + (5/8 + 11/8)
= 10/9 + 2 = 28/9
c) 21/12 + 4/11 + 7/11 - 11/12 = (21/12 - 11/12) + (4/11 + 7/11)
= 10/12 + 1 = 11/6
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3/2 x 4/7 = 6/7
8/21 : 2/3= 4/7
8/21 : 4/7 = 2/3
4/7 x 2/3 = 8/21
b) 3/11 x 2 = 6/11
6/11: 3/11 = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
Ngoài đẹp hơn thì chẳng có gì cả
Còn lag hơn và bất tiện hơn
![](https://rs.olm.vn/images/avt/0.png?1311)
L: \(\dfrac{7}{6}\) +\(\dfrac{8}{6}\) = \(\dfrac{15}{6}\)
T: \(\dfrac{1}{11}\) + \(\dfrac{7}{11}\) + \(\dfrac{9}{11}\) = \(\dfrac{17}{11}\)
Ạ: \(\dfrac{4}{11}\) + \(\dfrac{2}{11}\) = \(\dfrac{6}{11}\)
Đ: \(\dfrac{3}{6}\) + \(\dfrac{1}{6}\) + \(\dfrac{7}{6}\) = \(\dfrac{11}{6}\)
À: \(\dfrac{3}{11}\) + \(\dfrac{9}{11}\) = \(\dfrac{12}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: 2/11=4/22
19/22=19/22
b: 6/11=30/55
7/5=77/55
c: 7/8=35/40
8/5=64/40
d: 7/8=21/24
5/6=20/24
a: 2/11=4/22
19/22=19/22
b: 6/11=30/55
7/5=77/55
c: 7/8=35/40
8/5=64/40
d: 7/8=21/24
5/6=20/24
118<.......<117118<.......<117
Quy đồng mẫu số 2 phân số ta được :
7756<.......<88567756<.......<8856
Vậy các phân số có thể điền vào chỗ trống là : 7856;7956;...;8756