设公差为d
由题意,
S1=a1
S2=2a1+d
S4=4a1+6d
a1*(4a1+6d)=(2a1+d)^2
d^2-2a1*d=0
d(d-2a1)=0
d不等于0
所以d=2a1
故有(a2+a3)/a1=(a1+d+a1+2d)/a1=(a1+2a1+a1+4a1)/a1=8