3.(an)-арифметична прогресія:
а8+а10=15
а9-?
4.(bn)-геометрична прогресія :
b8×b10=144
b10-?
5.1+1/3+1/9+1/27....нескінченна прогресія :
S-?
6.(an ) - арифметична прогресія : а10=95
S10=500
a1-?
d-?
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