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a₁ = 1 a₅ = 4
a₅ = a₁ × q⁴
a₅/a₁ = q⁴
4 = q⁴
2² = (q²)²
2 = q²
q = √2 lub q = -√2
Możliwość I
1, 1√2, 1√2×√2, 1√2×√2×√2, 4 =
1, 1√2, 2, 2√2, 4
Możliwość II
1, -1√2, 2, -2√2, 4
4=q do pot 4;
q=4stop√4;
a1=1;
a2=a1×q=4st√4;
a3=a2×q=4st√4× 4st√4=4 st√16=2;
a4=a3×q=2×4st√4;
a5=a4×q=2×4st√4×4st√4=2×2=4;