dạ thưa anh TỪ NGUYỄN ĐỨC AN nín cho em nhờ

3 2/5 = (3x5)+2 trên 5 

          =17/5

k nhé

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Giải:

Ta có: 2n + 3 chia hết cho n + 1

=> ( 2n + 2 ) + 1 chia hết cho n + 1

=> 2( n + 1 ) + 1 chia hết cho n + 1

=> 1 chia hết cho n + 1

=> n + 1 = 1 hoặc n + 1 = -1

=> n = 0 hoặc n = -2

Vậy n thuộc {0;-2}

2 , 4 , 6 , 8 , 10

đs là 101 đó

k cho mik nha bạn ui

45 sai do minh thi roi

Diện tích tam giác sao ta / chiều cao nhân đáy chìa ra hai phần

đslà -100

k cho mik nha bạn ui

hì hì

 1/                          giải

dãy số trên có số số là :

                ( 1017 - 1 ) : 2 + 1 = 509 ( số )

                                 đáp số : 509 số