Question

Tính giá trị biết thức (làm đầy đủ):

a. 3/4 x 5/6 - 1/6 =........................................

b. (8/9 + 1/3) : 2/5 = ....................................

Answer 1

\(a.\dfrac{3}{4}\times\dfrac{5}{6}-\dfrac{1}{6}=\dfrac{5}{8}-\dfrac{1}{6}=\dfrac{11}{24}\)

\(b.\left(\dfrac{8}{9}+\dfrac{1}{3}\right):\dfrac{2}{5}=\dfrac{11}{9}:\dfrac{2}{5}=\dfrac{11}{9}\times\dfrac{5}{2}=\dfrac{55}{18}\)

Answer 2

a) \(\dfrac{3}{4}\times\dfrac{5}{6}-\dfrac{1}{6}=\dfrac{15}{24}-\dfrac{1}{6}=\dfrac{15}{24}-\dfrac{4}{24}=\dfrac{11}{24}\)

b) \(\left(\dfrac{8}{9}+\dfrac{1}{3}\right):\dfrac{2}{5}=\dfrac{11}{9}:\dfrac{2}{5}=\dfrac{11}{9}\times\dfrac{5}{2}=\dfrac{55}{18}\)