Oblicz sumę stu początkowych wyrazów ciągu arytmetycznego (an) a) a10= -1 , a100= -11,
a10 = -1
a100 = -11
a100 = a10 + 90r
-11 = -1 + 90r
90r = -10
r = -1/9
a1 = a10 - 9r = -1 + 1 = 0
suma = (a1 + a100) * 100 / 2 = -11 * 100 / 2 = -550
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a10 = -1
a100 = -11
a100 = a10 + 90r
-11 = -1 + 90r
90r = -10
r = -1/9
a1 = a10 - 9r = -1 + 1 = 0
suma = (a1 + a100) * 100 / 2 = -11 * 100 / 2 = -550