рррннр және қаласы бойынша мемлекеттік кірістер департаменті оңайлатылған және
Объяснение:
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Объяснение:
cn=3; 3²; ... S₅=?
c₁=3 c₂=3²
q=c₂/c₁=3²/3=9/3
q=3.
S₅=3*(3⁵-1)/(3-1)=3*(243-1)/2=3*242/2=3*121=363.
ответ: S₅=363.
xn=1,5; -3; ... x₄=?
x₁=1,5 x₂=-3
q=-3/1,5=-2
q=-2.
x₄=x₁*q³=1,5*(-2)³=1,5*(-8)=-12.
ответ: x₄=-12.