Объяснение:
an=2n2-1
2n2-an-1=0
D=a2+8
n1=a+√a2+8/4
n2=a-√a2+8/4
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Объяснение:
an=2n2-1
2n2-an-1=0
D=a2+8
n1=a+√a2+8/4
n2=a-√a2+8/4