Question

3 : 3/4

3/4 : 3

5 : 7/8

7/8 : 5

giúp mình đi

Answer 1

\(3:\dfrac{3}{4}=3.\dfrac{4}{3}=\dfrac{12}{3}\)

\(\dfrac{3}{4}:3=\dfrac{3}{4}.\dfrac{1}{3}=\dfrac{1}{4}\)

\(5:\dfrac{7}{8}=5.\dfrac{8}{7}=\dfrac{40}{7}\)

\(\dfrac{7}{8}:5=\dfrac{7}{8}.\dfrac{1}{5}=\dfrac{7}{40}\)

Answer 2

\(3:\dfrac{3}{4}=3\text{×}\dfrac{4}{3}=4\)

\(\dfrac{3}{4}:3=\dfrac{4}{3}\text{×}3=\dfrac{1}{4}\)

\(5:\dfrac{7}{8}=5\text{×}\dfrac{8}{7}=\dfrac{40}{7}\)

\(\dfrac{7}{8}:5=\dfrac{8}{7}\text{×}5=\dfrac{7}{40}\)

Answer 3

3:\(\dfrac{3}{4}\)=\(\dfrac{3}{1}\):\(\dfrac{3}{4}\)=\(\dfrac{1}{3}\)x\(\dfrac{3}{4}\)=\(\dfrac{1x3}{3x4}\)=\(\dfrac{3}{12}\)=\(\dfrac{1}{4}\)

\(\dfrac{3}{4}\):3=\(\dfrac{3}{4}\):\(\dfrac{3}{1}\)=\(\dfrac{3}{4}\)x\(\dfrac{1}{3}\)=\(\dfrac{3x1}{4x3}\)=\(\dfrac{3}{12}\)=\(\dfrac{1}{2}\)

5:\(\dfrac{7}{8}\)=\(\dfrac{5}{1}\):\(\dfrac{7}{8}\)=\(\dfrac{5}{1}\)x\(\dfrac{8}{7}\)=\(\dfrac{5x8}{1x7}\)=\(\dfrac{40}{7}\)

\(\dfrac{7}{8}\):5=\(\dfrac{7}{8}\):\(\dfrac{5}{1}\)=\(\dfrac{7}{8}\)x\(\dfrac{1}{5}\)=\(\dfrac{7x1}{8x5}\)=\(\dfrac{7}{40}\)