Question

Bài 1:rút gọn phân số \(\frac{3+15}{7+15}\)ta được phân số:

 

 

Answer 1

Ta có :\(\frac{3+15}{7+15}=\frac{18}{22}\)

rút gọn : \(\frac{18}{22}=\frac{18:2}{22:2}=\frac{9}{11}\)

vậy : \(\frac{3+15}{7+15}=\frac{9}{11}\)

Answer 2

\(\frac{3+15}{7+15}=\frac{3}{7+15}+\frac{15}{7+15}=\frac{3}{22}+\frac{15}{22}=\frac{18}{22}=\frac{9}{11}\)

Answer 3

\(\frac{3+15}{7+15}=\frac{18}{22}=\frac{18:2}{22:2}=\frac{9}{11}\)

Vậy.....