Question

8/21 chia  2/4 =  ?

3/11 nhân 2 = ?

4 nhân 2/7 = ?

8?5 chia 2/5 = ?

6/3 chia 2 = ?

Answer 1

8/21 : 2/4 = 16/21

3/11 x 2 = 6/11

4 x 2/7 = 8/7 

8/5 : 2/5 = 4

6/3 : 2 = 1 

Answer 2

Bài làm

\(\frac{8}{21}:\frac{2}{4}=\frac{8}{21}x\frac{4}{2}=\frac{16}{21}\)

\(\frac{3}{11}x2=\frac{6}{11}\)

\(4x\frac{2}{7}=\frac{8}{7}\)

\(\frac{8}{5}:\frac{2}{5}=\frac{8}{5}x\frac{5}{2}=\frac{8}{2}=4\)

\(\frac{6}{3}:2=\frac{6}{3}x\frac{1}{2}=\frac{6}{6}=1\)

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Answer 3

8/21:2/4=8/21x2=16/21

3/11x2=6/11

4x2/7=8/7

8/5:2/5=8/5x5/2=8/2=4

6/3:2=6/3x1/2=1

Answer 4

\(\frac{8}{21}:\frac{2}{4}=\frac{8}{21}\times\frac{4}{2}=\frac{32}{42}=\frac{16}{21}\)

\(\frac{3}{11}\times2=\frac{3\times2}{11}=\frac{6}{11}\)

\(4\times\frac{2}{7}=\frac{4\times2}{7}=\frac{8}{7}\)

\(\frac{8}{5}:\frac{2}{5}=\frac{8}{5}\times\frac{5}{2}=\frac{40}{10}=4\)

\(\frac{6}{3}:2=2:2=1\)

Answer 5

\(\frac{8}{21}:\frac{2}{4}=\frac{16}{21}\)

\(\frac{3}{11}\cdot2=\frac{6}{11}\)

\(4\cdot\frac{2}{7}=\frac{8}{7}\)

\(\frac{8}{5}:\frac{2}{5}=4\)

\(\frac{6}{3}:2=1\)

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