Question

[lecongtai]

tim cac so tu nhien x va y biet

4/x=y/21=28/49

Answer 1

[leducanh]

x=7 y=12

Answer 2

[Mai Đức Dũng]

\(\frac{28}{49}=\frac{4}{7}\)

\(\Rightarrow x=7\)

\(\frac{4}{7}=\frac{4\cdot3}{7\cdot3}=\frac{12}{21}\)

\(\Rightarrow y=12\)