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
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![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](/uploads/image/z/3921324-60-4.jpg?t=%E8%8B%A51%2Ca1%2Ca2%2Ca3%2C4%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C3%2Cb1%2Cb2%2Cb3%2C5%2C%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%88%99a2%2Fb2%E7%9A%84%E5%80%BC%E6%98%AFA+1%2F2B+-1%2F2C+%C2%B12D+%C2%B11%2F2)
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