a=38 đúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

ai tra loi duoc tui cho100k

7 + 2x + 4x = 19

2x + 4x = 19 - 7

6x = 12

  x = 12 : 6 

  x = 2

7 + 2x + 4x = 19

7 + x.( 2 + 4 ) = 19

x.( 2 + 4 ) = 19 - 7

x . 6 = 12

x =  12 : 6

x = 2

Số kẹo trong hủ còn lại số viên là:

         100:3/5=60(viên)

                   Đáp số :60 viên

60 viên

5, 25 cm nhé

25 cm nhé dành k cho mình nhé

à , đè bài là tìm thuộc stn sao cho .....
 

5/33

37/30

61/495

337/300

a) \(n+6⋮n\)

Mà \(n⋮n\Rightarrow6⋮n\)

\(\Rightarrow n\left\{1;2;3;6\right\}\)

b) \(4n+5⋮n\)

Mà \(4n⋮n\)\(\Rightarrow5⋮n\)

\(\Rightarrow n\in\left\{1;5\right\}\)

c) \(38-3n⋮n\)

Mà \(3n⋮n\Rightarrow38⋮n\)

\(\Rightarrow n\in\left\{1;2;19;38\right\}\)

d) \(n+5⋮n+1\)

\(\Rightarrow n+1+4\)

Mà \(n+1⋮n+1\Rightarrow4⋮n\)

\(\Rightarrow n\in\left\{1;2;4\right\}\)

e) \(3n+4⋮n-1\)

\(\Rightarrow3\left(n-1\right)+7⋮n-1\)

Mà \(3\left(n-1\right)⋮n-1\Rightarrow7⋮n\)

\(\Rightarrow n\in\left\{1;7\right\}\)

A = { 1;2;3;4;6;12 }

Các tập hợp con của A là:

{1} ; {2} ; {3} ; {4} ; {6} ; {12} 

{1;2} ; {1;3} 

Tự kể hết ra nhé

Ư(A)=1;2;3;4;6;12

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

cac phan con lai tuong tu