Question

Answer 1

Câu 7:

\(2m^25dm^2=205dm^2\)

2/5 phút=24 giây

5 tấn 25 kg=5025kg

2km21m=2021m

Answer 2

Câu 8 

\(x=\dfrac{12}{5}-\dfrac{3}{4}=\dfrac{48-15}{20}=\dfrac{33}{20}\)

\(x=\dfrac{4}{3}+\dfrac{2}{9}=\dfrac{12+2}{9}=\dfrac{14}{9}\)

\(\dfrac{x}{10}=\dfrac{11}{5}-\dfrac{1}{2}=\dfrac{22-5}{10}=\dfrac{18}{10}\Rightarrow x=18\)