Question

Tìm phân số thích hợp.

a) \(?:\dfrac{2}{7}=\dfrac{5}{11}\)                            b) \(\dfrac{3}{4}:?=\dfrac{5}{8}\)                              c) \(?\times\dfrac{6}{11}=1\)

Answer 1

\(a,?=\dfrac{5}{11}\times\dfrac{2}{7}=\dfrac{10}{77}\\ b,?=\dfrac{3}{4}:\dfrac{5}{8}=\dfrac{3}{4}\times\dfrac{8}{5}=\dfrac{6}{5}\\ c,?=1:\dfrac{6}{11}=\dfrac{11}{6}\)

Answer 2

a) \(?:\dfrac{2}{7}=\dfrac{5}{11}\)

\(?=\dfrac{5}{11}\times\dfrac{2}{7}\)

\(?=\dfrac{10}{77}\)

b) \(\dfrac{3}{4}:?=\dfrac{5}{8}\)

\(?=\dfrac{3}{4}:\dfrac{5}{8}\)

\(?=\dfrac{3}{4}\times\dfrac{8}{5}\)

\(?=\dfrac{6}{5}\)

c) \(?\times\dfrac{6}{11}=1\)

\(?=1:\dfrac{6}{11}\)

\(?=1\times\dfrac{11}{6}\)

\(?=\dfrac{11}{6}\)