Question

Tim x,y thuoc Z biet

x/4=18/x+1

 

Answer 1

x/4=18/x+1

=>x(x+1)=4.18=72=8.9=8.(8+1)

hoặc x(x+1)=72=(-9).(-8)=(-9).[(-9)+1]

=>x=8 hoặc x=-9

Answer 2

\(\frac{x}{4}=\frac{18}{x+1}\)

=> \(x\left(x+1\right)=4.18\)

=> x (x + 1) = 72

=> x (x + 1) = 8 . 9

=> x = 8

Answer 3

\(\frac{x}{4}=\frac{18}{x+1}\)

=> \(18.4=x\left(x+1\right)=72\)

Mà: 8 . 9 = 72 => x = 8 

k có ý ;) 

Answer 4

Ta có: \(\frac{x}{4}=\frac{18}{x+1}\)

\(\Rightarrow x.\left(x+1\right)=4.18\)

\(\Rightarrow x.\left(x+1\right)=72\)

\(\Rightarrow x.\left(x+1\right)=8.\left(8+1\right)=-9.\left(-9+1\right)\)

\(\Rightarrow x=8;-9\)

Answer 5

2 (x + 1 ) + 18 = - 4