Question

Tim cac so nguyen x; y biet 

a. \(\frac{10+x}{17+x}=\frac{3}{4}\)

b. \(\frac{40+x}{77-x}=\frac{6}{7}\)

Answer 1

\(1-\frac{10+x}{17+x}=1-\frac{3}{4}\)

\(\frac{7}{17+x}=\frac{1}{4}\)

\(\frac{7}{17+x}=\frac{7}{28}\Rightarrow17+x=28\)

\(x=28-17=11\)

Answer 2

Con Phan b thi Sao?

Answer 3

6.(77-x)=7.(40+x) do đó 462-6x=280+7x hay x=14

Answer 4

Tai Sao pan b ra 14