Question

23+x/40+x=3/4

Answer 1

\(\dfrac{x+23}{x+40}=\dfrac{3}{4}\)(ĐKXĐ: \(x\ne-40\))

=>\(4\left(x+23\right)=3\left(x+40\right)\)

=>4x+92=3x+120

=>4x-3x=120-92

=>x=28(nhận)

Answer 2

\(\dfrac{23+x}{40+x}=\dfrac{3}{4}\\ =>4\left(23+x\right)=3\left(40+x\right)\\ =>92+4x=120+3x\\ =>4x-3x=120-92\\ =>x=28\)