1,a1,a2,a3,4成等差数列,1,b1,b2,b3,4成等比数列,则a1+a2/b2详细

1,a1,a2,a3,4成等差数列,1,b1,b2,b3,4成等比数列,则a1+a2/b2详细
1,a1,a2,a3,4成等差数列,1,b1,b2,b3,4成等比数列,则a1+a2/b2
详细

1,a1,a2,a3,4成等差数列,1,b1,b2,b3,4成等比数列,则a1+a2/b2详细
4=1+4d, 4=1*q^4
d=3/4, q=根号2
a1=7/4, a2=10/4,b2=2
a1+a2/b2=7/4+10/4/2=3