Question

Tìm x

a)\(\frac{4}{x+2}=\frac{5}{7}\)

Answer 1

4/x+2= 5/7

=>5(x+2)=4.7

5(x+2)=28

x+2=28:5

x+2=28/5

x=28/5-2

x=28/5-10/5

x=18/5

Vậy x=18/5

Nhớ k cho mk nha!

Answer 2

\(\frac{4}{X+2}=\frac{5}{7}\Leftrightarrow5.\left(X+2\right)=4.7\Leftrightarrow5X+10=28\Leftrightarrow5X=18\Leftrightarrow X=\frac{18}{5}\)

Answer 3

\(\frac{4}{x+2}=\frac{5}{7}\)=>(x+2).5=4.7

=>5x+10=28

=>5x=28-10

=>5x=18

=>x=18/5

Answer 4

\(\frac{4}{x+2}=\frac{5}{7}\Rightarrow4\cdot7=\left(x+2\right)\cdot5\Rightarrow28=\left(x+2\right)\cdot5\Rightarrow x+2=\frac{28}{5}\Rightarrow x=\frac{28}{5}-2=\frac{18}{5}\)

Answer 5

x=18/5