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a fost răspuns

Aratati ca a apartine [0,(3);0,(5)],unde a=1/2x3+1/3x4+1/4x5....+1/29x30

Răspuns :

=1/2-1/3+1/3-1/4+1/4-1/5+...+1/29-1/30=1/2-1/30=28/60=7/15=0.4(6) 0.(3)《0.4(6)< 0.(5) adevarat

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