15/13
a4=a1+3d,a2=a1+d带入a1*a4=a2*a2(a1,a2,a4 依次成等比数列)
整理得a1=d
a1+a4+a10=3a1+12d=15d
a2+a4+a7=3a1+10d=13d
所以(a1+a4+a10)/(a2+a4+a7)=15/13
15/13
a4=a1+3d,a2=a1+d带入a1*a4=a2*a2(a1,a2,a4 依次成等比数列)
整理得a1=d
a1+a4+a10=3a1+12d=15d
a2+a4+a7=3a1+10d=13d
所以(a1+a4+a10)/(a2+a4+a7)=15/13