Question

5/45-40/5 trút gọn rồi quy đồng

Answer 1

\(\dfrac{1}{9}-\dfrac{8}{1}=\dfrac{1}{9}-\dfrac{72}{9}=\dfrac{-71}{9}\)

Answer 2

1/9- 8

= 1/9- 8/1

= 1/8- 72/9

= -71/9

Answer 3

\(\dfrac{5}{45}=\dfrac{5:5}{45:5}=\dfrac{1}{9}\);

\(\dfrac{40}{5}=\dfrac{40:5}{5:5}=\dfrac{8}{1}=8\)

\(\dfrac{1}{9}-8=\dfrac{1}{9}-\dfrac{72}{9}=-\dfrac{71}{9}\)