Question

Tìm x :

2 / 7 : x = 8 / 21

 

Answer 1

x=2/7 : 8/21

Answer 2

\(\frac{2}{7}:x=\frac{8}{21}\)

\(\Rightarrow x=\frac{2}{7}:\frac{8}{21}\)

\(\Rightarrow x=\frac{2}{7}\cdot\frac{21}{8}\)

\(\Rightarrow x=\frac{2\cdot21}{7\cdot8}=\frac{2\cdot7\cdot3}{7\cdot2\cdot4}=\frac{3}{4}\)

Answer 3

\(\frac{2}{7}:x=\frac{8}{21}\)

\(x=\frac{2}{7}:\frac{8}{21}\)

\(x=\frac{2}{7}\times\frac{21}{8}\)

\(\Rightarrow x=\frac{3}{4}\)

Answer 4

Bạn Tớ thấy bài khó

Answer 5

x=2/7 : 8/21

x=2/7 nhân 21/8

x=3/4