Question

Tìm xx trong tỉ lệ thức sau:

     72:32=27:x72:32=27:x

Answer 1

\(\frac{72}{32}=\frac{27}{\frac{x72}{32}}=\frac{27}{x}\)

\(\Leftrightarrow\frac{9}{4}=\frac{3}{\frac{x}{4}}=\frac{27}{x}\)

\(\Leftrightarrow9.\frac{x}{4}=12\)

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

\(\Leftrightarrow x=16:3=\frac{16}{3}\)

\(\Leftrightarrow2x=\frac{16}{3}27\)

\(\Leftrightarrow2x=144\)

\(\Leftrightarrow x=144:2=72\)