В Арифметической прогрессии (аn) a1=13,2 а15=-24,6.Найдите разность арифмитической прогресии.
an = a1 + d(n-1)
a15 = 13.2 + 14d
-24.6-13.2 = 14d
14d = -37.8
d = -2.7
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an = a1 + d(n-1)
a15 = 13.2 + 14d
-24.6-13.2 = 14d
14d = -37.8
d = -2.7