1)Arătați că :
a)1/2< 1/20+ 1/21+ 1/22+ ...+ 1/39< 1
b)1 / 2la 2 +1/3la 2+1/4la 2+...+1/401la 2 <400/401
2)Determinați valorile lui n apatine N pentru care avem:
a)1/4 <(n+1)la 2 /24 <5/3
b)1/4 <(2n+1)la 2/36 <7/3
c)1/4 <(3n-1) la 2 / 48 <5/3
aaflorian:
cum pot sa termin celelalte 2 puncte cu care am ramas restanta?
Răspunsuri la întrebare
Răspuns de
1
1)a) 


....................................................

+

(1)
≤


.........................................

+
(2)
din (1) si (2) ⇒cerinta
b)


.............................

+

2)a)
Inmultim totul cu 24
]
⇒n=2,3,4,5
....................................................
+
.........................................
+
din (1) si (2) ⇒cerinta
b)
.............................
+
2)a)
Inmultim totul cu 24
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