1.\(=\dfrac{2}{5}:\dfrac{1}{2}\)

2.\(=\dfrac{1}{3}+\dfrac{1}{3}\)

3.\(=\dfrac{39}{35}:\dfrac{11}{7}\)

1.\(=\dfrac{2}{5}:\dfrac{1}{2}\)

2.\(=\dfrac{1}{3}+\dfrac{1}{3}\)

3.\(=\dfrac{39}{35}:\dfrac{11}{7}\)

1.\(\dfrac{4}{5}\)

2.\(\dfrac{2}{3}\)

3.\(\dfrac{39}{55}\)

\(=4,5\times5,7-0,55\)

\(=25,1\)

e mới lớp 6 mà đã thi gần hết r .-.

a) 0.75

b) 5 tấn 400 tạ

c)5060000

d)0.8

k 10 ẹ.-.

=))