Odpowiedź:
m = 11
n = 4
q= - 2
a₁ + a₂+a₃ + a₄ + a₅= 11/4
a₁ + a₁q + a₁q²+ a₁q³+ a₁q⁴ = 11/4
a₁(1+ q + q² + q³ + q⁴)= 11/4
a₁[1 + (- 2)+ (-2)²+(-2)³+(-2)⁴]= 11/4
a₁(1 - 2 + 4 - 8 + 16) = 11/4
a₁ * (21 - 10) = 11/4
a₁ * 11 = 11/4
a₁ = 11/4 : 11 = 11/4 * 1/11 = 11/44 = 1/4
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Odpowiedź:
m = 11
n = 4
q= - 2
a₁ + a₂+a₃ + a₄ + a₅= 11/4
a₁ + a₁q + a₁q²+ a₁q³+ a₁q⁴ = 11/4
a₁(1+ q + q² + q³ + q⁴)= 11/4
a₁[1 + (- 2)+ (-2)²+(-2)³+(-2)⁴]= 11/4
a₁(1 - 2 + 4 - 8 + 16) = 11/4
a₁ * (21 - 10) = 11/4
a₁ * 11 = 11/4
a₁ = 11/4 : 11 = 11/4 * 1/11 = 11/44 = 1/4