x = { x . N* ) : 1

Ta có:14 chia hết cho 2x-1

=>2x-1=Ư(14)

Ư(14)={1;2;7;14}

Nếu:2x-1=1 =>x=(1+1):2=1 (Đúng)

Nếu:2x-1=2 =>x=(2+1):2 (Sai)

Nếu:2x-1=7 =>x=(7+1):2=4 (Đúng)

Nếu:2x-1=14 =>x=(14+1):2 (Sai)

Vậy: x=1;4

\(14⋮\left(2x-1\right)\)

\(\Rightarrow\left(2x-1\right)\inƯ\left(14\right)=\left\{1,2,7,14\right\}\)

\(2x-1=1\Rightarrow2x=1+1=2\Rightarrow x=2:2=1\)

\(2x-1=2\Rightarrow2x=2+1=3\Rightarrow x=\frac{3}{2}\)

\(2x-1=7\Rightarrow2x=7+1=8\Rightarrow x=8:2=4\)

\(2x-1=14\Rightarrow2x=14+1=15\Rightarrow x=\frac{15}{2}\)

\(x\in\left\{1,\frac{3}{2},4,\frac{15}{2}\right\}\)

{143-[(36:4+14]}.27:36+174

{143-[(9+14)]}.27:36+174

{143-23}.27:36+174

120.27:36+174

3240:36+174

90+174

264

[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>[(36:4+14]}.27:36+174</p><p>{143-[(9+14)]}.27:36+174</p><p>{143-23}.27:36+174</p><p>120.27:36+174</p><p>3240:36+174</p><p>90+174</p><p>264</p> </div>

65536 + 256  }                 65792

----------------   |  ==>      -------------

8192    +  32  }                  8224

Chọn mình nha =(^-^)= !!! <3

a) chia hết cho 2 thì có các chữ số là 0 ; 2 ;4 ;6 ;8 nên 10602 có chia hết cho 2

    chia hết cho 3 thì lấy các số trong 1060 công với nhau : 1 + 0 + 6 + 2 = 9  vậy có chia hết cho 3

==> tổng này chia hết cho 2 và 3

muộn rồi nên mình ko giải được tiếp mong bạn tích minh

mai mimh giải típ cho

b) 53 . 93 + 47 . 93 - 79 . 62 - 38 . 79

= 93 . ( 47 + 53) . 79 . ( 62 - 38 )

= 93 . 100 . 79 . 24

= 9300 . 1896

= 17632800

giá trị của x,y có thể là (x+1)=1 hoặc 5

                                     (y-2) =1 hoặc 5

=> x=5-1

     x=1-1

y=5+2

y=1+2

Sau những kết quả đó ta thấy đc rằng nếu x=4 thì y=7

                                                             nếu x=0 thì y=3

vậy nếu x=4 thì y=7

      nếu x=0 thì y =3

\(\left(x+1\right)\left(y-2\right)=5\)

\(\Rightarrow\left(x+1\right),\left(y-2\right)\inƯ\left(5\right)=\left\{1,5\right\}\)

\(\hept{\begin{cases}x+1=1\\y-2=5\end{cases}\Rightarrow\hept{\begin{cases}x=1-1=0\\y=5+2=7\end{cases}}}\)

\(\hept{\begin{cases}x+1=5\\y-2=7\end{cases}\Rightarrow\hept{\begin{cases}x=5-1=4\\y=7+2=9\end{cases}}}\)

Vậy:\(\hept{\begin{cases}x=0\\y=7\end{cases}hoặc}\hept{\begin{cases}x=4\\y=9\end{cases}}\)

2n + 7 chia hết n+ 1

<=> 2n + 2 + 5 chia hết n + 1

<=> 2 (n + 1) +5 chia hết n + 1

vì 2 ( n+ 1) chia hết n + 1

=> 5 chia hết n + 1

=> n  + 1 thuộc ước của 5

Đến đây lập bảng ra là xong !

2n + 7 chia hết n+ 1

<=> 2n + 2 + 5 chia hết n + 1

<=> 2 (n + 1) +5 chia hết n + 1

vì 2 ( n+ 1) chia hết n + 1

=> 5 chia hết n + 1

=> n  + 1 thuộc ước của 5 ={ -5;-1;1;5}

P/s tham khảo nha