Question

tìm x trong các tỉ lệ thức sau :a) \(\frac{x}{3,15}\)= \(\frac{0,15}{7,2}\)

                                          

Answer 1

\(\frac{x}{3,15}=\frac{0,15}{7,2}\)

\(\Rightarrow7,2x=0,15\cdot3,15=0,4725\)

\(\Rightarrow x=0,4725:7,2=0,065625\)

Answer 2

\(\frac{x}{3,15}=\frac{0,15}{7,2}\)

=> x.7,2 = 3,15.0,15

=> x.7,2 = 0,4725

=>       x = 0,4725 : 7,2

=>       x = 0,065625

    Vậy x = 0,065625 

Answer 3

\(\frac{x}{3,15}=\frac{0,15}{7,2}\)

\(\Rightarrow x.7,2=3,15.0,15\)

\(x.7,2=0,4725\)

\(x.\frac{72}{10}=\frac{4725}{10000}\)

\(x=\frac{4725}{10000}:\frac{72}{10}\)

\(x=\frac{47250}{720000}=\)tự rút gọn