Question

Lập các cặp phân số bằng nhau từ các số sau:
a) 2 ; 3 ; -6 ; -4 ; -9             b) 4 ;5 ; -2 ; -8 ; -10             c) 2 ; 4 ; 6 ; 3         
d) 2 ; 8; 4; 1

Answer 1

a: \(\dfrac{2}{-4}=\dfrac{3}{-6};\dfrac{-4}{2}=\dfrac{-6}{3};\dfrac{2}{3}=\dfrac{-4}{-6};\dfrac{2}{-4}=\dfrac{3}{-6}\)

\(\dfrac{2}{3}=\dfrac{-6}{-9};\dfrac{2}{-6}=\dfrac{3}{-9};\dfrac{3}{2}=\dfrac{-9}{-6};\dfrac{-6}{2}=\dfrac{-9}{3}\)

b: \(\dfrac{4}{5}=\dfrac{-8}{-10};\dfrac{4}{-8}=\dfrac{5}{-10};\dfrac{5}{4}=\dfrac{-10}{-8};\dfrac{-8}{4}=\dfrac{-10}{5}\)

\(\dfrac{-2}{5}=\dfrac{4}{-10};\dfrac{-2}{4}=\dfrac{5}{-10};\dfrac{5}{-2}=\dfrac{-10}{4};\dfrac{4}{-2}=\dfrac{-10}{5}\)

c: \(\dfrac{2}{4}=\dfrac{3}{6};\dfrac{2}{3}=\dfrac{4}{6};\dfrac{4}{2}=\dfrac{6}{3};\dfrac{3}{2}=\dfrac{6}{4}\)

d: \(\dfrac{2}{8}=\dfrac{1}{4};\dfrac{2}{1}=\dfrac{8}{4};\dfrac{8}{2}=\dfrac{4}{1};\dfrac{1}{2}=\dfrac{4}{8}\)