Odpowiedzi

2010-04-09T19:12:55+02:00
Zad.1
an=a1+(n-1)r
an=-4+(n-1)3
an=-4+3n-3
an=3n-7
Sn=a1+an/n*n
732=-4+3n-7/2*3
732=12+9n-21/2 /*2
1464=12+9n-21
9n=12-21-1464
9n=-1479
n=-163,66