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więc
a₂=27q
a₃=27q²
a₁=27
a₄=-3
27q²-27q=-3-27q²
27q²+27q²-27q+3=0
54q²-27q+3=0 /:3
18q²-9q+1=0
Δ=81-72
√Δ=3
q₁=1/6
q₂=⅓
dla q=1/6
a₂=27*1/6 =9/2
a₃=27*1/36=3/4
lub dla q=1/3
a₂=27*1/3 =9
a₃=27*1/9 =3
to zadanie ma 2 rozwiązania