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0
2024-03-11 22:47:36
a
2023-12-26 21:42:55
Ta có: dấu phẩy của số bé dịch sang bên phải 1 chữ số thì được số lớn
=> số bé = 1/10 số lớn
=> số bé = 18,7 : (1 + 10) x 1 = 1,7
=> sô lớn = 18,7 - 1,7 = 17
2023-09-19 20:25:02
Tận cùng là 0
2023-09-09 21:37:36
challenging
2023-01-03 21:15:38
3 (25 : 5 - 14 : 2) - 5 (6 : 2)
= 3 (5 - 7) - 5.3
= 3.(- 2) - 15
= - 6 - 15
= - 21
2023-01-03 21:12:34
2022-12-30 22:45:17
2022-12-30 22:31:11
Có 3n chia hết n+1
n+1 chia hết n+1
=> 3n - 3(n+1) chia hết n+1
=> -3 chia hết n+1
=> U(-3)=1,-1,3,-3
n+1 | 1 | -1 | 3 | -3 |
n | 0 | -2 | 2 | -4 |
=> n thuộc {0;-2;2;-4}
2022-11-07 20:55:57
Có: (100-1):1+1=100 (số số hạng)
Tổng: (100+1).100:2=5050
(Tính theo công thức số số hạng)