y=log2(3-2x-x^2)单调递减区间1,求y=log2(3-2x-x^2)的单调递减区间2,-9,a1,a2,-1是等差数列,-9,b1,b2,b3,-1是等比数列,求b2(a2-a1)的值
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![y=log2(3-2x-x^2)单调递减区间1,求y=log2(3-2x-x^2)的单调递减区间2,-9,a1,a2,-1是等差数列,-9,b1,b2,b3,-1是等比数列,求b2(a2-a1)的值](/uploads/image/z/9301835-11-5.jpg?t=y%3Dlog2%283-2x-x%5E2%29%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B41%2C%E6%B1%82y%3Dlog2%283-2x-x%5E2%29%E7%9A%84%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B42%2C-9%2Ca1%2Ca2%2C-1%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C-9%2Cb1%2Cb2%2Cb3%2C-1%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E6%B1%82b2%28a2-a1%29%E7%9A%84%E5%80%BC)
y=log2(3-2x-x^2)单调递减区间1,求y=log2(3-2x-x^2)的单调递减区间2,-9,a1,a2,-1是等差数列,-9,b1,b2,b3,-1是等比数列,求b2(a2-a1)的值
y=log2(3-2x-x^2)单调递减区间
1,求y=log2(3-2x-x^2)的单调递减区间
2,-9,a1,a2,-1是等差数列,-9,b1,b2,b3,-1是等比数列,求b2(a2-a1)的值
y=log2(3-2x-x^2)单调递减区间1,求y=log2(3-2x-x^2)的单调递减区间2,-9,a1,a2,-1是等差数列,-9,b1,b2,b3,-1是等比数列,求b2(a2-a1)的值
1.满足3-2x-x^2>0且f=3-2x-x^2为单调减区间
求得为[-1,1]
2.公差d=(-1+9)/3=8/3
故a2-a1=d=8/3
由b2*b2=9得b2=3或-3
由b2=-9q^2得b2
单调递减区间应该是-1
单调递减区间 -1