Nếu bạn ko hiểu thì mik gửi ảnh cho:

       Chúc bạn học tốt!

Ta có: n3+n2+1⋮n+1" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">n3+n2+1⋮n+1n3+n2+1⋮n+1 

⇔n2(n+1)+1⋮n+1" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">⇔n2(n+1)+1⋮n+1⇔n2(n+1)+1⋮n+1

mà n2⋅(n+1)⋮n+1" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">n2⋅(n+1)⋮n+1n2⋅(n+1)⋮n+1

nên 1⋮n+1" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">1⋮n+11⋮n+1

⇔n+1∈Ư(1)" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">⇔n+1∈Ư(1)⇔n+1∈Ư(1)

⇔n+1∈{1;−1}" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">⇔n+1∈{1;−1}⇔n+1∈{1;−1}

hay n∈{0;−2}" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">n∈{0;−2}n∈{0;−2}

Vậy: Để n3+n2+1⋮n+1" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">n3+n2+1⋮n+1n3+n2+1⋮n+1 thì n∈{0;−2}" role="presentation" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-style: normal; font-weight: normal; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-size: 18.08px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;">n∈{0;−2}

     CHÚC BẠN HỌC TỐT!

`(5-x)(x+7)=0`

`@TH1:5-x=0=>x=5`

`@TH2:x+7=0=>x=-7`

Cho A=n.(n+3) + 2013 không chia hết cho 9

(2⁴³+2⁴):(2³⁹+1)

=2⁴⁷:2⁴⁰

=2⁴⁰

giúp mình với, mình đang cần gấp

Diện tích phần còn lại là:

`64-2=62(m^2)`

Số cây hoa trồng được là:

`62 xx 4 = 248(cây)`

Số tiền để mua hoa hồng là:

`248 xx 50.000 = 12400000(đồng)`

D/s....

215 = 5 x 43

Ư(215) = { 1; 5; 43; 215}

230 = 2x5x23 

Ư(230) ={ 1; 2; 5; 10; 23; 46; 115; 230}

mk cần gấp giúp mk vs

`a)180=2^{2}.3^{2}.5`

`b)2034=2.3^{2}.113`

`c)1500=2^{2}.3.5^{3}`

`d)4000=2^{5}.5^{3}`

`e)504=2^{3}.3^{2}.7`

\(180=2^2.3^2.5\)

\(2034=2.3^2.113\)

\(1500=2^2.3.5^3\)

\(4000=2^5.5^3\)

\(504=2^3.3^2.7\)