Question

Найдите значение дробей:

Answer 1

1) 
( 48^2 - 45^2 ) / ( 74^2 - 19^2 ) = ( ( 48 - 45 )( 48 + 45 )) / (( 74 - 19 )( 74 + 19 )) =  ( 3*93 ) / ( 55*93 ) = 3/55 
2) 
( 88^2 - 53^2 ) / ( 20^2 - 15^2 ) = ( ( 88 - 53 )( 88 + 53 )) / ( ( 20 - 15 )( 20 + 
+ 15 )) = ( 35 * 141 ) / ( 5 * 35 ) = 141/5 = 28,2 
3) 
( 89^2 - 61^2 ) / ( 89^2 - 2*89*61 + 61^2 ) = ( ( 89 - 61 )( 89 + 61 )) /
/ ( 89 - 61 )^2 = ( 89 + 61 ) / ( 89 - 61 ) = 150 / 28 = 5 10/28 = 
= 5 5/14