已知数列-1,a1,a2,-4成等差数列,-1,b1,b2,b3,-16成等差数列,则a2-a1/b2等于多少
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![已知数列-1,a1,a2,-4成等差数列,-1,b1,b2,b3,-16成等差数列,则a2-a1/b2等于多少](/uploads/image/z/8564039-71-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97-1%2Ca1%2Ca2%2C-4%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C-1%2Cb1%2Cb2%2Cb3%2C-16%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%88%99a2-a1%2Fb2%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
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已知数列-1,a1,a2,-4成等差数列,-1,b1,b2,b3,-16成等差数列,则a2-a1/b2等于多少
已知数列-1,a1,a2,-4成等差数列,-1,b1,b2,b3,-16成等差数列,则a2-a1/b2等于多少
已知数列-1,a1,a2,-4成等差数列,-1,b1,b2,b3,-16成等差数列,则a2-a1/b2等于多少
-1+3a=-4,a=-1,a1=-2,a2=-3
-1*q^4=-16,q=+/-2,b2=-4
所以=1/4
a1=-2,a2=-3
b1=-9/4
b2=-7/2
b3=-19/4
所以是2/7
a1=-2,a2=-3
b1=-4,b2=-8,b3=-12
带入式中 -3-(-2)/(-8)=-2.75