![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Dãy này có: (10-1):1+1=10 số hạng
trung bình 1 số là: ( 10/11 +1/11):2=1/2
tổng của dãy là: 1/2*10=5 đ/s:5
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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)
\(\dfrac{14}{21}\times\dfrac{2}{11}+\dfrac{1}{11}:\dfrac{3}{2}+\dfrac{2}{3}:\dfrac{11}{4}+\dfrac{4}{11}\times\dfrac{16}{24}\\ =\dfrac{2}{3}\times\dfrac{2}{11}+\dfrac{1}{11}\times\dfrac{2}{3}+\dfrac{2}{3}\times\dfrac{4}{11}+\dfrac{4}{11}\times\dfrac{2}{3}\\ =\dfrac{2}{3}\times\left(\dfrac{2}{11}+\dfrac{1}{11}+\dfrac{4}{11}+\dfrac{4}{11}\right)\\ =\dfrac{2}{3}\times\dfrac{2+1+4+4}{11}\\ =\dfrac{2}{3}\times\dfrac{11}{11}=\dfrac{2}{3}\times1=\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1/11 + 2/11 + 3/11 + 4/11 + ........... + 10/11
= 1 + 2 + 3 + 4 + ........... + 10
= ( 10 - 1 ) : 1 + 1 = 10
= ( 10 + 1 ) x 10 : 2 = 55
= 55/11 = 5
tk nha. chuc bn hoc gioi
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2.Tínhnhẩm:
51 x 11 = 561 | 59 x 11 = 649 |
91 x 11 = 1001 | 45 x 11 =495 |
88 x 11 = 968 | 89 x 11 =979 |
99 x 11 = 1089 | 94 x 11 = 1034 |
![](https://rs.olm.vn/images/avt/0.png?1311)
9/11 : y = 2/5 + 2/7
9/11 :y = 24/35
y = 9/11 : 24/35
y = 105/88
y * 3/11 = 3/4 - 6/11
y * 3/11 = 9/44
y = 9/44 : 3/11
y = 3/4
Bạn thamkhaor nhé
2/11<3/11
2/11<3/11