2. ( bn ) - геометрична прогресія :
b1 =81
q = 1/3
S8 =?
3.(an)-арифметична прогресія:
а4 + а6 = 52
а5-?
4. (bn)-геометрична прогресія : b4×b6=441
b5-?
5.2 -2/5 + 2/25-2/125 ....нескінченна прогресія : S-?
6.(bn ) - геометрична прогресія :
b3 = 625
b7 = 81
b1 -?
q -?
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