Question

Решите плиз №168
№168.Вычислите

Answer 1

1)(84,5²-59,5²)/(61²-11²)=(84,5-59,5)(84,5+59,5)/(61-11)(61+11)=25*144/50*72=2/2=1
2)(124²-144)/(239²-1089)=(124²-12²)/(239²-33²)=(124-12)(124+12)/(239-33)(239+33)=
=112*136/206*272=112/206*2=56/206=28/103
3)(106²-11²)/(122²-8²)=(106-11)(106+11)/(122-8)(122+8)=95*117/114*130=3/4
4)(13,5²-8,5²)/(73,5²-68,5)²=(13,5-8,5)(13,5+8,5)/(73,5-68,5)(73,5+68,5)=5*22/5*142=
=11/71

Answer 2

спасибо