Bạn chưa đăng nhập. Vui lòng đăng nhập để hỏi bài

Những câu hỏi liên quan
Pham Trong Bach
Xem chi tiết
Cao Minh Tâm
12 tháng 4 2017 lúc 3:32

Giải bài 1 trang 163 sgk Toán 5 | Để học tốt Toán 5

Cinderella
Xem chi tiết
Lê Thị Mỹ Duyên
21 tháng 10 2015 lúc 18:57

1, 65,6 : 32 = 2,05.

2, 338 : 65 = 5,2.

3, 30,24 : 4,8 = 6,3.

4, 12 : 6,25 = 1,92.

5, 24,44 : 5,2 = 4,7.

6, 25,2453 : 24,51 = 1,03.

7, 0,039 : 0,78 = 0,05.

8, 19 : 3,8= 5.

Cinderella
21 tháng 10 2015 lúc 19:03

mất chút thời gian đặt tính ra ko được à

NGUYỄN HÀ THƯ
18 tháng 3 2022 lúc 19:46

952 chia cho v8 = bao nh

Khách vãng lai đã xóa
Lợn Còii
Xem chi tiết
Trần Nhật Quỳnh
14 tháng 3 2017 lúc 21:46

Đặt A = 1 + 2 + 4 + 8 + 16 + … + 4096 + 8192
Ta có: A = 20 + 21 + 22 + 23 + 24 + … + 212 + 213 (1)
Nhân cả hai vế của (1) cho 2, ta được: 2A = 21 + 22 + 23 + 24 + 25 + … + 213 + 214 (2)
Lấy (2) - (1), ta được: 2A - A = 21 + 22 + 23 + 24 + 25 + … + 213 + 214 - (20 + 21 + 22 + 23+ 24 + … + 212 + 213)
A = 21 - 20 + 22 - 21  + 23 - 22  + 24 - 23 + 25 - 24  + … + 213 - 212  + 214  - 213
A = 214 - 20
A = 16384 - 1
A = 16383

Maria
14 tháng 3 2017 lúc 21:47

dãy trên có số chữ số là:

( 8192 - 2 ) : 2 + 1 = 4096

tổng là:

( 2 + 8192 ) x 4096 : 2 = 16781312

Phan Trà Giang
14 tháng 3 2017 lúc 21:53

2 + 4 + 6 + ... + 8192

= 2 + 4 + 6 + 8 + 16 + 32 + 64 + 128 + 256 + 512 + 1024 + 2048 + 4096 + 8192 = 16382

(Quy luật : Lấy một số nhân với 2 sẽ ra số liền kề nó)

Nguyễn Thanh Tùng
Xem chi tiết
nguyen trang
Xem chi tiết

3675:35=105  THỬ LẠI: 105.35=3675

81,92:32=2,56 THỬ LẠI : 2,56.32=81,92

20219:37=CÂU NÀY RA KẾT QUẢ DƯ RA BN

97,65:21,7=4,5 THỬ LẠI : 4,5.21,7=97,65

K CHO MK NHA

CÓ GÌ SAI THÌ MONG BN BỎ QUA NHA

Cinderella
Xem chi tiết
Trần Thùy Linh A1
4 tháng 11 2015 lúc 20:27

đạt tính rồi thử lại =máy tính
 

Lê Thị Mỹ Duyên
4 tháng 11 2015 lúc 20:27

em ơi đặt tính lâu lắm.

Trịnh Nhật Minh
30 tháng 8 2021 lúc 8:15

a,82.95

a

'

Khách vãng lai đã xóa
nguyên
Xem chi tiết
kẻ giấu mặt
14 tháng 4 2016 lúc 18:33

3675 : 35 = 105

81,92 : 32 = 2,56

20219 : 37 = 546,4594595

97,65 : 21,7 = 4,5

nguyên
14 tháng 4 2016 lúc 18:53

cảm ơn bạn nhiều 

vo thi van anh
17 tháng 4 2016 lúc 11:55

Tinh roi thu lai (theo mẫu) a) 3675: 35

Phan Thuý Quýnh
Xem chi tiết
không lấy vợ nhưng sợ cô...
23 tháng 4 2018 lúc 22:13

a,3675:35=105

thử lạ:105x35=3675

20219:37=546,459

thử lại:546,459x37=20219

b,81,92:32=2,56

thử lại:2,56x32=81,92

97,65:21,7=4,5

thử lại:4,5x21,7=97,65

nguyễn tuấn anh
Xem chi tiết
Trần Thanh Phương
7 tháng 12 2018 lúc 18:11

Đặt A = 1 + 2 + 4 + ... + 8192

A = 1 + 2 + 22 + ... + 213

=> 2A = 2 + 22 + 23 + ... + 214

=> 2A - A = ( 2 + 22 + 23 + ... + 214 ) - ( 1 + 2 + 22 + ... + 213 )

<=> A = 214 - 1

<=> A = 16383

Vậy A = 16383

Nguyễn Minh Quân
7 tháng 12 2018 lúc 18:56

16383

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