Question

Tìm x biết :

\(\dfrac{3}{x+5}\)= 15%

Answer 1

45

Answer 2

45

Answer 3

=45

Answer 4

\(\dfrac{3}{x+5}=15\%\\ \Rightarrow\dfrac{3}{x+5}=\dfrac{15}{100}\\ \Rightarrow15\cdot\left(x+5\right)=3.100\\ \Rightarrow15x+75=300\\ \Rightarrow15x=225\\ \Rightarrow x=15\)

Answer 5

45

Answer 6

\(\dfrac{3}{x+5}=\dfrac{3}{20}\)

nên x+5=20

hay x=15

Answer 7

=15