Ответ:
Объяснение:
a9= a1+8d
S17= (2a1+16d)*17/2= 2(a1+8d)*17/2= 17(a1+8d)
187= 17(a1+8d)
a9=11
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Verified answer
Ответ:
Объяснение:
a9= a1+8d
S17= (2a1+16d)*17/2= 2(a1+8d)*17/2= 17(a1+8d)
187= 17(a1+8d)
a9=11