Question

giúp mk với mn ơi

Answer 1

2/5 + 3/5 : (3/5 + -2/3) - 3 1/2

⇔ 2/5 + 3/5 : (-1/15) - 7/2

⇔ 2/5 + (-9) - 7/2

⇔ -43/5 - 7/2

⇔ -121/10

Vậy ...

Answer 2

 \(d,\)\(\dfrac{2}{5}+\dfrac{3}{5}:\left(\dfrac{3}{5}+\dfrac{-2}{3}\right)-3\dfrac{1}{2}\)

\(=\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{4}{5}-\dfrac{7}{2}\)

\(=\dfrac{2}{5}+\dfrac{3}{4}-\dfrac{7}{2}\)

\(=\dfrac{23}{20}-\dfrac{7}{2}\)

\(=\dfrac{-3}{5}\)

\(#Thư\)

Answer 3

d)\(=\dfrac{2}{5}+\dfrac{3}{5}\times\dfrac{5}{4}-\dfrac{2}{7}=\dfrac{2}{5}+\dfrac{3}{4}-\dfrac{7}{2}=\dfrac{23}{20}-\dfrac{7}{2}=-\dfrac{3}{5}\)