TESTUL 2, PUNCTELE 1,2,3. DAU CORONITA SI 30 PUNCTE.

TESTUL 2 PUNCTELE 123 DAU CORONITA SI 30 PUNCTE class=

Răspuns :

1.
a)9
b)11^3=1331
c)rad(81+144)=rad225=15
2.
2+4+6+...+2n=n(n+1)
2n=100 =>n=50
2+4+6+...+100=50×51=2550
2550-50=2500
rad2500=50
3.
rad961 | 31
9 | 61•1=61
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