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.

mất chút thời gian đặt tính ra ko được à

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

dãy trên có số chữ số là:

( 8192 - 2 ) : 2 + 1 = 4096

tổng là:

( 2 + 8192 ) x 4096 : 2 = 16781312

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

đạt tính rồi thử lại =máy tính
 

em ơi đặt tính lâu lắm.

3675 : 35 = 105

81,92 : 32 = 2,56

20219 : 37 = 546,4594595

97,65 : 21,7 = 4,5

cảm ơn bạn nhiều 

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

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

16383

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