Tìm 
$n\in Z$ biết 3n+8)⋮(n+1)" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-family:quicksand; font-size:15.82px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word" class="MathJax_CHTML mjx-chtml">(3n+8)⋮(n+1)

a) Tìm x biết (x+1)+(x+3)+(x+5)+...+(x+99)=0

  AI NHANH ĐÚNG TK

1. tìm x ; y biết : ​ 3.x2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>x</strong>}}^{\mathrm{<strong>2</strong>}}$.y + 5. 2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>x</strong>}}^{\mathrm{<strong>2</strong>}}$2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml"> +2.x.2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">+3y22" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>y</strong>}}^{\mathrm{<strong>2</strong>}}$ + 5.2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">y
   2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">${\mathrm{<strong>y</strong>}}^{\mathrm{<strong>2</strong>}}$ = 16

tìm x ∈ Z biết : 16()2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-family:open sans,sans-serif; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x−5)3)2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-family:open sans,sans-serif; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">$\mathrm{<strong>x</strong>}<strong>-</strong>\mathrm{<strong>1</strong>}{<strong>)</strong>}^{\mathrm{<strong>2</strong>}}$ = (x −)2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">5))2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">5

Cho $P$=$\frac{1}{2}$ +$\frac{1}{3}$ +...+$\frac{1}{2019}$ và $Q$=$\frac{1}{2018}$ +$\frac{2}{2017}$ +$\frac{3}{2016}$ +...+$\frac{2016}{3}$ +$\frac{2017}{2}$ +$\frac{2018}{1}$ Tính (Q&#x2212;2019.P)2019" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:21.78px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">(Q−2019.P)2019$(Q-2019.P{)}^{2019}$

tìm x ∈ Z biết : a, ( x - 1) * ( x - 2 ) * ( 5 - x ) < 0 b , 9(x&#x2212;1)2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:22.5px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">(x−1)2$(x-1{)}^2$ + 8(y&#x2212;1)2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:22.5px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">(y−1)2$(y-1{)}^2$ = 25 c , 3()8" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:22.5px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x−5)8$x-5{)}^8$ = 27()3" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:22.5px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x−5)3$x-5{)}^3$ d , 16 ( x - 5)^3 = (x - 5)^5

tìm x ∈ Z biết :

16()2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-family:open sans,sans-serif; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x−5)3$x-1{)}^2$ = 8( )2" role="presentation" style="border-image-outset:initial; border-image-repeat:initial; border-image-slice:initial; border-image-source:initial; border-image-width:initial; border:0px; direction:ltr; display:inline-block; float:none; font-family:open sans,sans-serif; font-size:23.4px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x - 5)⁵

Mai và Lan mỗi người mua cho tổ mình một số hộp bút chì màu. Mai mua $28$ bút, Lan mua $36$ bút. Số bút trong các hộp bút đều bằng nhau và số bút trong mỗi hộp lớn hơn $2$.

a) Gọi số bút trong mỗi hộp là $a$. Tìm quan hệ giữa số $a$ với mỗi số $28,36,2$.

b) Tìm số $a$ nói trên.

c) Hỏi Mai mua bao nhiêu hộp bút chì màu ? Lan mua bao nhiêu hộp bút chì màu ?

Học sinh lớp $6C$ khi xếp hàng $2$, hàng $3$, hàng $4$, hàng $8$ đều vừa đủ hàng. Biết số học sinh lớp đó trong khoảng từ $35$ đến $60$. Tính số học sinh lớp 6C.

a) (x - 6)² = 9

b) 35 - 3.|x| = (2³ - 4)

c) |x| + |-5| = |-45|

d) 6.x + x = 5¹¹ : 5⁹ + 3¹

e) 7.x - x = 5²¹ : 5¹⁵ + 3.2² - 7⁰

f ) 2^x : 2⁵ = 1

g) 2^x+1.2²⁰¹⁴ = 2²⁰¹⁵

h) | x - 5 | = 7 - (-3)

i) | - x - 16| = 31

k) &#x22EE;x;84&#x22EE;x;30&#x22EE;x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">150⋮x;84⋮x;30⋮x$150⋮x;84⋮x;30⋮x$ và 0 < x < 16 ($x\in N$) &#x22EE;12;x&#x22EE;15;x&#x22EE;18" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">x⋮12;x⋮15;x⋮18$x⋮12;x⋮15;x⋮18$

l) &#x22EE;12;x&#x22EE;15;x&#x22EE;18" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal" class="MathJax_CHTML mjx-chtml">x⋮12;x⋮15;x⋮18$x⋮12;x⋮15;x⋮18$ và x < 150 ($x\in N$)