设中间的等差是a-d,a,a+d
则开始等比是a-d,a-4,a+d
所以(a-4)^2=(a+d)(a-d)
a^2-8a+16=a^2-d^2
a=(d^2+16)/8
后面等比是a-d,a,a+d+32
a^2=(a-d)(a+d+32)=a^2-d^2+32a-32d
d^2+32d=32a=32(d^2+16)/8=4d^2+64
3d^2-32d+64=0
(d-8)(3d-8)=0
d=8,d=8/3
a=(d^2+16)/8=10,26/9
所以是
2,6,18和2/9,-10/9和50/9