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9x^2 - 12x + 4 + 12x = 9x^2 + 4
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Ответ:
Объяснение:
5; 5/6; ... b₁=5 b₂=5/6
q=b₂/b₁=(5/6)/5=1/6.
b₄=b₁*q³=5*(1/6)³=5/216.
Sn=b₁*(qⁿ-1)/(q-1)
S₄=5*((1/6)⁴-1))/((1/6)-1)=5*((1/1296-1))/(-5/6)=
=-6*(-1295/1296)=1285/216=5²¹⁵/²¹⁶.
Ответ: q=1/6 b₄=5/216 S₄=5²¹⁵/₂₁₆.
X^5-x^7+3x+С
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