Question

rút gọn phân số

72/70  ; 85/75 ; 54/85; 30/70 ; 125/250

 

Answer 1

\(\dfrac{72}{70}=\dfrac{72:2}{70:2}=\dfrac{36}{35}\)

\(\dfrac{85}{75}=\dfrac{85:5}{75:5}=\dfrac{17}{15}\)

\(\dfrac{54}{85}\) giữ nguyên

\(\dfrac{125}{250}=\dfrac{125:125}{250:125}=\dfrac{1}{2}\)

\(\dfrac{30}{70}=\dfrac{30:10}{70:10}=\dfrac{3}{7}\)

Answer 2

`72/70=36/35   ; 85/75=17/15 ; 54/85=54/85; 30/70=3/7 ; 125/250=1/2`

Answer 3

\(\dfrac{72}{70}=\dfrac{72 : 2}{70 : 2}=\dfrac{36}{35};\dfrac{85}{75}=\dfrac{85 : 5}{75 : 5}=\dfrac{17}{15}\)
\(\dfrac{54}{85}\) không rút gọn được
\(\dfrac{30}{70}=\dfrac{30 : 10}{70 : 10}=\dfrac{3}{7};\dfrac{125}{250}=\dfrac{125 : 125}{250 : 125}=\dfrac{1}{2}\)