Tính rồi thử lại
8192 : 32
Tính rồi thử lại (theo mẫu):
8192 : 32;
15335 : 42
Chú ý: phép chia hết: a : b = c, ta có a = b x c (b > 0)
Phép chia có dư: a : b = c (dư r), ta có a = b x c + r (0 < r < b).
đặt tính rồi tính rồi thử lại
1 , 65 , 6 : 32
2 , 338 : 65
3 , 30,24/4,8
4 , 12/6,25
5 , 24,4444/5,2
6 , 25,2453/24,51
7,0,039/0,78
8,19/3,8
các bạn nhớ đặt tính rồi tính và thử lại nhé
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.
952 chia cho v8 = bao nh
Tính ; 2 + 4 + 8 + 16 + 32 + 64 +..... + 8192
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
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)
Đặt tính rồi thử lại 41472:12 Thử lại 1800:34 Thử lại
tính rồi thử lại
3675 : 35 20219 : 37
81,92 : 32 97,65 : 21,7 [ thương là số thập phân ]
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
đặt tính rồi tính xong thử lại ( ghi chú : thử lại = hàng dọc và thử lại = phép tính chia )
a: 23,7x3,5
b :0,59x8,9
c:5,154x6,8
tính rồi thử lại
3675 : 35
81,92 : 32
20219 : 37
97,65 : 21,7
nhớ xem kĩ đầu bài và làm đầy đủ cách làm nhé
3675 : 35 = 105
81,92 : 32 = 2,56
20219 : 37 = 546,4594595
97,65 : 21,7 = 4,5
Tinh roi thu lai (theo mẫu) a) 3675: 35
tính rồi thử lại:
a) 3675:35
20219:37
b) 81,92:32
97,65:21,7 ( thương là số thập phân)
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
Tính tổng :
1 + 2 +4 +8 +16 + 32 + .... +8192
[ trình Bày lời giải ]
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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