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Nguyễn Thị Hằng

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Trung bình cộng của hai phân số bằng 7/8. 

Nếu tăng phân số thứ nhất lên gấp 3 lần thì trung bình cộng của chúng bằng 17/8. Tìm phân số thứ hai?

 

Trần Cao Vỹ Lượng
28 tháng 9 2016 lúc 9:03

tổng 2 phân số là :

\(\frac{7}{8}\) X 2 = \(\frac{7}{4}\)

Tổng của phân số thứ nhất và 3 lần phân số thứ hai là :

\(\frac{17}{8}\)X 2 = \(\frac{17}{4}\)

phân số thứ hai là:

(\(\frac{17}{4}-\frac{7}{4}\)) X 2 = \(\frac{5}{4}\)

Phân số thứ nhất là :

\(\frac{7}{4}-\frac{5}{4}=\frac{2}{4}\)

Đáp số : \(\frac{5}{4}\)và \(\frac{2}{4}\)

Nguyễn Ngọc Anh Minh
28 tháng 9 2016 lúc 8:57

Tổng 2 phân số

7/8x2=7/4

Nếu gấp phân số thứ nhất lên 3 lần thì được phân số mới

Tổng của phân số mới với phân số thứ 2 là

17/8x2=17/4

Tổng mới hơn tổng cũ là

17/4-7/4=10/4

Trong 1 tổng nếu 1 số hạng gấp lên n lần thì tổng mới tăng thêm n-1 lần số hạng được tăng => Tổng mới đã tăng so với tổng cũ 3-1=2 lần phân số thứ nhất

Phân số thứ nhất là

10/4:2=5/4

Phân số thứ 2 là

7/4-5/4=1/2

Phạm Hoàng Anh
9 tháng 10 2016 lúc 21:14

thằng chó nguye ngoc anh minh  kia

Hoàng Lam Phương
12 tháng 10 2016 lúc 20:22

nay ban pham hoang anh sao ban lai noi ban anh minh nhu vay the la khong hay dau

Vũ Thùy Ngọc Linh
13 tháng 10 2016 lúc 15:26

bằng 5/4

Trần Thị Lâm Hiền
19 tháng 10 2016 lúc 14:46

1/2 mình thi rồi

Vũ Huy Phương
23 tháng 10 2016 lúc 12:30

1/2 đúng rồi nhưng sao Phạm Hoàng Anh lại chửi bạn?????

hoàng kiều trinh
25 tháng 10 2016 lúc 11:40

SAO LẠI CHỬI THẾ ?

Usagi
21 tháng 11 2016 lúc 11:51

1/2 moi dung to thi roi. chuc ban hoc tot

hoang thi hong nhung
23 tháng 11 2016 lúc 19:39

đáp án của tớ là 1/2

tớ nghĩ bài của Vũ Thùy Ngọc Linh sai bét 

mai khanh nai
30 tháng 11 2016 lúc 21:05

không được chửi thế chứ.

Trương Việt Hoàng
3 tháng 12 2016 lúc 19:00

5/4 la đung

Nguyen Thi Phuong Thao
17 tháng 12 2016 lúc 9:54

Hoang anh sao lai chui ban

Nguyễn Quỳnh Anh
18 tháng 12 2016 lúc 9:22

Câu trả lời của mình là 3/4 mình vừa làm đúng luôn

Tachibana Kanade
25 tháng 12 2016 lúc 9:29

mình cũng ra là 1/2

Nguyễn Thị Mỹ Hạnh
2 tháng 1 2017 lúc 16:28

trong violympic mink làm 1/2 đúng đấy !

Nguyễn Thẩm Chi
18 tháng 1 2017 lúc 9:33

1/2 là đúng đó

tran thi ai
4 tháng 2 2017 lúc 17:02

sai hết không có đáp án nào

Nguyễn Trần Trung Hiếu
5 tháng 2 2017 lúc 15:48

1/2 là đúng

brykusto araiky
13 tháng 2 2017 lúc 12:27

1/2 đấy mình thử rồi!

mình k cho Usagi.

Phan Thi  Thanh Truc
24 tháng 2 2017 lúc 19:58

trần thị ái ngu quá 1/2 là đúng đấy con si

Huynh Thao Tran
11 tháng 3 2017 lúc 8:09

1/2 hay 5/4

Nguyen Canh Nhat
16 tháng 5 2017 lúc 19:52

sai hat roi

Trần Hoàng Vũ
28 tháng 6 2017 lúc 9:46

dung ko day

Liên Minh Huyền Thoại
28 tháng 6 2017 lúc 12:11

MẤY EM CHO ANH XIN SĐT

nguyễn thị hương giang
22 tháng 7 2017 lúc 9:36

cong chua1/2 la dung day

nguyễn đức vượng 2
25 tháng 7 2017 lúc 15:01

\(\frac{5}{4}\)nha bn

...................

k nha

dinhhoanghamy
9 tháng 8 2017 lúc 20:29

1/2 nha

Winxbloom
29 tháng 9 2017 lúc 21:49

1/2 đúng rồi còn gì

Vũ Thành Công
22 tháng 10 2017 lúc 9:54

1/2

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