等差数列an,公差d不等于0,a1 a3 a4 等比求(a1+a3+a9)/(a2+a4+a10)

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等比a3²=a1a4
(a1+2d)²=a1(a1+3d)
a1d+4d²=0
d≠0
a1=-4d
所以原式=(a1+a1+2d+a1+8d)/(a1+d+a1+3d+a1+9d)
=(3a1+10d)/(3a1+13d)
=(-12d+10d)/(-12d+13d)
=-2

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等差数列an,公差d不等于0,a1 a3 a4 等比 求(a1+a3+a9)/(a2+a4+a10)