T
0
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
DH
12 tháng 2 2017
a) => n+1 thuộc ước của 7
Ư(7)={-1;1;-7;7}
vì n>3 nên n=7
b) =>n+3 thuộc ước của 15
Ư(15)={-1;1;-3;3;-5;5;-15;15}
vì 7 < n < 10 nên n = 15
c) ta có : n+7 = (n+3) +4
mà n+3 chia hết cho n+3
=> 4chia hết cho n+3
=> n+3 thuôc ước của 4
Ư(4)={-1;1;-2;2;-4;4}
=> ta có bảng sau:
| n+3 | -1 | 1 | -2 | 2 | -4 | 4 |
| n | -4 | -2 | -5 | -1 | -7 | 1 |
= 2(n+2) +2d) ta có : 2n + 6 = ( 2n+4) +2
mà n+2 chia hết cho n+2 nên 2(n+2) cũng chia hết cho n+2
=> 2 phải chia hết cho n+2
=> n+2 thuộc ươc của 2
=> Ư(2)={-1;1;-2;2}
=> ta có bảng sau
| n+2 | -1 | 1 | -2 | 2 |
| n | -3 | -1 | -4 | 0 |
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
20 tháng 3
a; 35 ⋮ \(x\) + 3
\(x+3\) \(\in\) Ư(35) = {-35; - 7; -5; -1; 1; 5; 7; 35}
Lập bảng ta có:
| \(x+3\) | -35 | -7 | -5 | -1 | 1 | 5 | 7 | 35 |
| \(x\) | -38 | -10 | -8 | -4 | -2 | 2 | 4 | 32 |
Theo bảng trên ta có:
\(x\in\) {-38; -10; -8; -4; -2; 2; 4; 32}
Kết luận: \(x\) {-38; -10; -8; -2; 2; 4; 32}
-
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
20 tháng 3
b; 10 ⋮ 2\(x\) + 1
2\(x\) + 1 \(\in\) Ư(10) = {-10; -5; -2; -1; 1; 2; 5; 10}
Lập bảng ta có:
| 2\(x+1\) | -10 | -5 | -2 | -1 | 1 | 2 | 5 | 10 |
| \(x\) | -11/2 | -3 | -3/2 | -1 | 0 | 3/2 | 2 | 11/2 |
Theo bảng trên ta có: \(x\in\) {-11/2; -3; -3/2; -1; 0; 3/2; 2; 11/2}
15 tháng 10 2017
a. goi ba so tu nhien chan do la a nhan 2, a nhan 2 +2,a nhan 2 +4
theo bai ra ta co : tong ba so chan lien tiep la : a*2+a*2+2+a*2+4 = ( a*2+a*2+a*2) + (2+4)= a*6+6=6*(a+1)
vi 6 chia het cho 6 nen 6*(a+1)chia het cho 6
26 tháng 7 2016
Để 35* chia hết cho 2
=> * = {2 ; 4 ; 6 ; 8}
Để 1*2 chia hết cho 3
=> 1 + 2 + * chia hết cho 3
=> 3 + * chia hết cho 3
=> * = {0;3;6;9}
Để 1*5* chia hết cho 5
=> dấu * thứ 2 = {0 ; 5)
Với * thứ 2 = 0
=> 1 + * + 5 + 0 chia hết cho 9
=> 6 + * chia hết cho 9
=> * thứ 1 = 3
Với dấu sao thứ 2 = 5
=> 1 + * + 5 + 5 chia hết cho 9
=> 11 + * chia hết cho 9
=> * thứ 1 = 7
TH
2
10 tháng 10 2017
a=38 đúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%