Question

Tính (theo mẫu).

Mẫu: \(\dfrac{2}{5}\times3=\dfrac{2}{5}\times\dfrac{3}{1}=\dfrac{2\times3}{5\times1}=\dfrac{6}{5}\) Ta có thể viết gọn như sau: \(\dfrac{2}{5}\times3=\dfrac{2\times3}{5}=\dfrac{6}{5}\)

a) \(\dfrac{9}{11}\times8\)                           b) \(\dfrac{4}{5}\times1\)                     c) \(\dfrac{15}{8}\times0\)

Answer 1

a) \(\dfrac{9}{11}\times8=\dfrac{9\times8}{11}=\dfrac{72}{11}\)

b) \(\dfrac{4}{5}\times1=\dfrac{4\times1}{5}=\dfrac{4}{5}\)

c) \(\dfrac{15}{8}\times0=\dfrac{15\times0}{8}=\dfrac{0}{8}=0\)

Answer 2

a: 9/11*8=(9*8)/11=72/11

b: 4/5*1=(4*1)/5=4/5

c: 15/8*0=(15*0)/8=0/8=0