А) =√ ((165-124)(165+124)/164) =√(289*41/164)=17/2=8,5
б) =√((149-76)(149+76)/((457-384)(457+384)))=
=√(73*225/(73*841)) =√(225/841) =15/29
в) =√( 98/((176-112)(176+112)) ) =√(98/(64*144))=
=√(49/(64*144)=7/(8*12)=7/96
г) =√((145,5-96,5)(145,5+96,5)/((193,5-31,5)(193,5+31,5)))=
=√(49*242/(162*225)) = √(49*121/(81*225)) = 7*11/(9*15)=77/135