Question

B) (39.5 ^ 2 - 5.5 ^ 2)/(57.5 ^ 2 - 14.5 ^ 2)​

Answer 1

$\displaystyle\bf\\\frac{39,5^{2} -5,5^{2} }{57,5^{2} -14,5^{2} } =\frac{(39,5-5,5)\cdot(39,5+5,5)}{(57,5-14,5)\cdot(57,5+14,5)} =\\\\\\=\frac{34\cdot 45}{43\cdot 72} =\frac{17\cdot45}{43\cdot36} =\frac{17\cdot 5}{43\cdot 4} =\frac{85}{172}$