若1,a1,a2,a3,4成等比数列,3,b1,b2,b3,5,成等差数列,则a2/b2的值是A 1/2B -1/2C ±2D ±1/2

若1,a1,a2,a3,4成等比数列,3,b1,b2,b3,5,成等差数列,则a2/b2的值是A 1/2B -1/2C ±2D ±1/2
若1,a1,a2,a3,4成等比数列,3,b1,b2,b3,5,成等差数列,则a2/b2的值是
A 1/2
B -1/2
C ±2
D ±1/2

若1,a1,a2,a3,4成等比数列,3,b1,b2,b3,5,成等差数列,则a2/b2的值是A 1/2B -1/2C ±2D ±1/2
a2=+2或-2
b2=4
a2/b2=1/2或-1/2
答案选 D