Question

Tính 

mở ngoặc 1/2 + 1/3 đóng ngoặc x 2/5

mọi người nhớ đóng mở ngoặc nha

 

Answer 1

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{2}{5}=\dfrac{5}{6}\times\dfrac{2}{5}=\dfrac{2}{6}=\dfrac{1}{3}\)

Answer 2

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{2}{5}=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{2}{5}=\dfrac{5}{6}\times\dfrac{2}{5}=\dfrac{1}{3}\times\dfrac{1}{1}=\dfrac{1}{3}\)

Answer 3

 

 

Answer 4

\(\dfrac{1}{3}\)

Answer 5

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\)x\(\dfrac{2}{5}\) \(=\dfrac{5}{6}\) x \(\dfrac{2}{5}=\dfrac{2}{6}=\dfrac{1}{3}\)

Answer 6

1/3

Answer 7

(X-1) (Y+2)=5