Thằn Lằn

Khi cộng một số tự nhiên với một số thập phân,do sơ suất một học sinh đã viết nhầm dấu phẩy của số thập phân lùi sang phải một hàng nên kết quả tìm được là 87,8. Tìm số thập phân đó biết kết quả đúng là 51,98 .

Băng Dii~
12 tháng 12 2016 lúc 15:23

Dấu phẩy của số thập phân lùi sang phải một hàng

=> số đó tăng lên 10 lần

9 lần số thập phân :

 87,8 - 51,98 = 35,82

Số thập phân đó :

35,82 : 9 = 3,98

đ/s : 3,98

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Nguyễn Hương Ly
18 tháng 12 2016 lúc 11:23

3,98 là kết quả đúng rồi vì hôm qua mình vừa thi violympic xong

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vuvanduc
18 tháng 12 2016 lúc 16:46

đúng 100%

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Lưu Quang Dũng
18 tháng 12 2016 lúc 18:21

3.98 nha bạn . Đúng 100 % đó . :))

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Phan Thi Thuy Linh
18 tháng 12 2016 lúc 18:30

có đúng 100% hay không

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Từ Nguyễn Đức Anh
21 tháng 12 2016 lúc 18:45

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Đ/S: 3,98

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Anh lớn
3 tháng 1 2017 lúc 20:43

3,98 đúng 100% lun đó 

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Nhi
10 tháng 1 2017 lúc 20:22

3,98 đung 100% lun

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oOo Vũ Khánh Linh oOo
17 tháng 1 2017 lúc 19:44

Dấu phẩy của số thập phân lùi sang phải một hàng
=> số đó tăng lên 10 lần
9 lần số thập phân :
87,8 ‐ 51,98 = 35,82
Số thập phân đó :
35,82 : 9 = 3,98
đ/s : 3,98

chúc bạn làm bài tốt nha :3

Bình luận (0)
Nguyễn Phương Linh
19 tháng 1 2017 lúc 18:41

 9 lan so thap phan la:

 87,8-51,98=35,82

 so thap phan la:

 35,82: (10 -1)=3,98

 dap so : 3,98

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ffunboddy
23 tháng 1 2017 lúc 8:50

3,98 la dung

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so anh tuyet
23 tháng 1 2017 lúc 19:53

là 3,98 là đúng đấy mình làm violympic rồi

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Hoàng Thị Minh Trâm
2 tháng 2 2017 lúc 21:31

3,98 là đúng 100%

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lê thị diệu hương
10 tháng 2 2017 lúc 21:44

Ket ban voi minh nhe

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nguyen phuong uyen
11 tháng 2 2017 lúc 14:45

dap so la 3,98 . dung mot 100 % luon do ban . chuc ban lam bai tot 

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Bùi Lan Anh
30 tháng 3 2017 lúc 19:58

3,98 là đúng

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tran trong ky
10 tháng 4 2017 lúc 20:11

tinh kieu rang cung ra 3 ,98 hay viet vao dung 100% do

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aikatsu
16 tháng 4 2017 lúc 20:24

3.98 là chuẩn ko cần chỉnh!!!

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Nguyễn Việt Hoàng
18 tháng 7 2017 lúc 14:46

Khi viết nhầm dấu phẩy ở số thập phân sang bên phải một hàng tức là đã gấp số đó lên 10 lần. 
Theo đề bài:
Số thập phân + Số tự nhiên  = 51,98
10 × Số thập phân  +  Số tự nhiên = 87,8
Suy ra: Số thập phân là: (87,8 - 51,98) : 9 = 3,98

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Nguyen Duc Vuong Quan
15 tháng 12 2017 lúc 12:25

3,98 nhé 100% luôn.

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Nguyen Duc Vuong Quan
15 tháng 12 2017 lúc 12:26

3,98 đấy 100%.

Bình luận (0)
Châu dễ thương
18 tháng 12 2017 lúc 19:37

Kết quả là 3,98 đó!!!!!!

Mik thử rùi.1000000000000000000000000000000000000000000000000000000000000000000000000% luôn

Bình luận (0)
ngô quốc cường
21 tháng 12 2017 lúc 14:17

3,98 

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Bình luận (0)
đoàn khánh linh
22 tháng 12 2017 lúc 20:16

3.98dung 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Gukmin
14 tháng 1 2018 lúc 17:43

                                       

                                                   Bài giải

Chuyển dấu phẩy của một số thập phân lùi sang phải một hàng

=>Số đó gấp lên 10 lần

9 lần số thập phân là:

       87,8-51,98=35,82

Số thập phân đó là:

       35,82:9=3,98

                  Đáp số:3,98

Mk vừa mới làm xong đó.k mk nha.

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anhhungsteve
18 tháng 1 2018 lúc 20:48

ae kb vs mik nha

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doctor
15 tháng 3 2018 lúc 20:22

sao đoàn khánh linh vớ vẩn thế .viet 3,98 la duoc roi them may so 0 sau day lam gi

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Lai Kuan Lin
29 tháng 3 2018 lúc 21:34

3,98 mình vừa thi violympic xong

Bình luận (0)
Tran Dinh Thong
14 tháng 4 2018 lúc 14:10

3,98

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Bình luận (0)
lã quốc hoàng
20 tháng 1 2019 lúc 9:09

3,98 là đúng

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