√‎c+√‎d=84.53

25c-36d/5√‎c-6√‎d-1√‎d=(5√‎c-6√‎d)(5√‎c+6√‎d)/ 5√‎c-6√‎d -1√‎d =5√‎c+6√‎d-1√‎d=5√‎c+5√‎d= 5(√‎c+√‎d)=5×84.53=422.65=423

Ответ: 423