Question

вычислите 181² - 61²/ 319² - 209²

Answer 1

$frac{(181^{2}- 61^{2} ) }{( 319^{2}- 209^{2}) } = frac{(181-61)(181+61)}{(319-209)(319+209)} = frac{(120*242)}{(110*528)} = frac{12*2*11*11)}{(11*2*11*24} =1/2$

Answer 2

(181-61)(181+61)/(319-209)(319+209)= 120*242/110*528= 12*10*2*121/11*10*4*132=
12*11*11/11*2*12*11= 1/2= 0,5