th1:x/2+x/3-1=2

<=>5x/6=3

<=>5x=18

<=>x=18/5

th2:x/2+x/3-1=-2

<=>5x/6=-1

<=>5x=-6

<=>x=-6/5
Vậy...

nhanh giúp mình ik mà ~ please

\(\dfrac{x}{2.4}+\dfrac{x}{4.6}+\dfrac{x}{6.8}+...+\dfrac{x}{98.100}=2\\ \Rightarrow x.\left(\dfrac{1}{2.4}+\dfrac{1}{4.6}+\dfrac{1}{6.8}+...+\dfrac{1}{98.100}\right)=2\\ \Rightarrow x.\left[\dfrac{1}{2}.\left(\dfrac{2}{2.4}+\dfrac{2}{4.6}+\dfrac{2}{6.8}+...+\dfrac{2}{98.100}\right)\right]=2\\ \Rightarrow x.\left[\dfrac{1}{2}.\left(\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{8}+...+\dfrac{1}{98}-\dfrac{1}{100}\right)\right]=2\Rightarrow x.\left[\dfrac{1}{2}.\left(\dfrac{1}{2}-\dfrac{1}{100}\right)\right]=2\\ \Rightarrow x.\left[\dfrac{1}{2}.\left(\dfrac{50}{100}-\dfrac{1}{100}\right)\right]=2\\ \Rightarrow x.\left[\dfrac{1}{2}.\dfrac{49}{100}\right]=2\\ \Rightarrow x.\dfrac{49}{200}=2\\ \Rightarrow x=2:\dfrac{49}{200}\\ \Rightarrow x=2.\dfrac{200}{49}\\ \Rightarrow x=\dfrac{400}{49}\)

x/2.4+x/4.6+...+x/98.100=2

<=>x(1/2.4+1/4.6+...+1/98.100)=2

<=>1/2x(1/2-1/4+1/4-1/6+...+1/98-1/100)=2

<=>1/2x(1/2-1/100)=2

<=>1/2x49/100=2

<=>49/200x=2

<=>x=400/49

Bài này theo mình thấy là cho thiếu dữ kiện

Có số góc đỉnh O đc tạo thành là:
   10 . ( 10 - 1 ) : 2 = 45 ( góc ) 
 - Hoktot - 
 

(x + 4) . (y + 3) = 3 

⇒ (x + 4) . (y + 3) = 1 . 3 = 3 . 1 = (-1) . (-3) = (-3) . (-1)

Ta có bảng sau:

Vậy (x,y) ϵ {(-3 ; 0) , (-1 ; -2) , (-5 ; -6) , (-7 ; -4)}

a

mình mới lm đc câu a b thôi

\(\sqrt{x^4\times4}=2^3\times2^2\) 

 \(\sqrt{x^4\times4}=8:4\)

\(\sqrt{x^4\times4}=2\)

 \(x^4=4:2\)

 \(x^4=\)\(2^4\)