Question

[Đặng Quang Hiếu]

Tính bằng hai cách:

3/22×3/11×22

(1/2+1/3)×2/5

3/5×17/21+17/21×2/5

Answer 1

[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: =17/21(3/5+2/5)=17/21