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a₂=6
z właściwości ciągu geometrycznego
a₂/a₁ = 6/3√2 = (6*√2)/(3√2*√2) = 6√2/6 =√2 to nasz q iloraz ciagu geometrycznego
a₃ = a₁*q² = 6√2
a₄ = a₁*q³= 3√2 * (√2)³ = 3√2 * √8 = 12
3√2+6 - (6√2 +12) = 3√2+6 - 6√2 - 12 = -6-3√2 = 3(-2 -√2)