Se consideră numerele reale
a= (0,(3)+radical25/radical15^2-12^2)^-1
b=(42/radical98-radical3^2+4^2+radical56/radical7):5+|radical2-3|
a)aratati ca 9/8
b)aratati ca media geometrica a numerelor a si b apartine multimii i=(radical2,radical3​