\(\frac{x}{42}=\frac{156}{504}\)
\(\Rightarrow x\times504=156\times42\)
\(\Rightarrow x\times504=6552\)
\(\Rightarrow x=6552:504\)
\(\Rightarrow x=13\)
Cách 2 :
\(\frac{x}{42}=\frac{156}{504}\)
\(\Rightarrow x=156\times42:504\)
\(\Rightarrow x=13\)
\(\frac{x}{42}=\frac{156}{504}\)
\(\Rightarrow Xx504=156x42\)
\(\Rightarrow Xx504=6552\)
\(\Rightarrow\)\(X=6552:504\)
\(\Rightarrow X=13\)