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Daca a= 7 + radical din 5 si b= 7- radical din 5 atunci: a) Media aritmetica a numerelor a si b este .....?? b) Media geometrica a numerelor a si b este ...... ?

Răspuns :

a=7+√5
b=7-√5
ma=(a+b)/2=(7+√5+7-√5)/2=14/2=7

mg=√ab=√(7+√5)(7-√5)=√(49-5)=√44=2√11
a=7+5√                                                                                                            b=7-√5                                                                                                             ma=(a+b)/2=(7+√5)=√44=2√11