Question

[Bphuongg]

Tính bằng hai cách :

a) 3/22 x 3/11 x 22

b) ( 1/2 + 1/3 ) x 2/5

c) 3/5 x 17/21 + 17/21 x 2/5

Answer 1

[Bphuongg]

nhanh lên

Answer 2

[Nguyễn Lê Phước Thịnh]

a: \(=\dfrac{3}{22}\cdot22\cdot\dfrac{3}{11}=3\cdot\dfrac{3}{11}=\dfrac{9}{11}\)

b: \(=\dfrac{5}{6}\cdot\dfrac{2}{5}=\dfrac{1}{3}\)

c: \(=\dfrac{17}{21}\left(\dfrac{3}{5}+\dfrac{2}{5}\right)=\dfrac{17}{21}\)