Question

329²-271² / 529²-471² =?

Answer 1

$329^2-271^2=(329-271)(329+271)=58\cdot 600\\529^2-471^2=(529-471)(529+471)=58\cdot 1000\\\frac{58\cdot 600}{58\cdot 1000}=\frac{6}{10}=\frac{3}{5}$