Ответ:
1. a2=a1×q. 9=3×q. q=3
2. b3=b1×q². b3=8×4=32
3. b4=b1×q³=-25×(-1/5)³=1/5
4. 972=4×3'. 3'=243 '=5 n=5+1=6
5. an=(-7)×2n-1
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Ответ:
1. a2=a1×q. 9=3×q. q=3
2. b3=b1×q². b3=8×4=32
3. b4=b1×q³=-25×(-1/5)³=1/5
4. 972=4×3'. 3'=243 '=5 n=5+1=6
5. an=(-7)×2n-1