Решение 

solve({`*`(x, `*`(y)) = 60, `+`(`*`(2, `*`(x)), `*`(2, `*`(y))) = 34}) 

{x = 12, y = 5}, {x = 5, y = 12} (22.2.1)
 

d = sqrt(`+`(`^`(5, 2), `^`(12, 2))) 

d = 13 (22.2.2)