已知f(x)=ln(x+1),g(x)=1/2ax^2+bx,(1)若b=2,且h(x)=f(x-1)-g(x)存在单调递减区间,求a的取值范围(2)a=0,b=1时,试判断f(x)与g(x)图像的公共点的个数并说明理由在明天12点以前要看,
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![已知f(x)=ln(x+1),g(x)=1/2ax^2+bx,(1)若b=2,且h(x)=f(x-1)-g(x)存在单调递减区间,求a的取值范围(2)a=0,b=1时,试判断f(x)与g(x)图像的公共点的个数并说明理由在明天12点以前要看,](/uploads/image/z/13910803-43-3.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3Dln%28x%2B1%29%2Cg%28x%29%3D1%2F2ax%5E2%2Bbx%2C%EF%BC%881%EF%BC%89%E8%8B%A5b%3D2%2C%E4%B8%94h%28x%29%3Df%28x-1%29-g%28x%29%E5%AD%98%E5%9C%A8%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B4%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89a%3D0%2Cb%3D1%E6%97%B6%2C%E8%AF%95%E5%88%A4%E6%96%ADf%28x%29%E4%B8%8Eg%28x%29%E5%9B%BE%E5%83%8F%E7%9A%84%E5%85%AC%E5%85%B1%E7%82%B9%E7%9A%84%E4%B8%AA%E6%95%B0%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%E5%9C%A8%E6%98%8E%E5%A4%A912%E7%82%B9%E4%BB%A5%E5%89%8D%E8%A6%81%E7%9C%8B%2C)
已知f(x)=ln(x+1),g(x)=1/2ax^2+bx,(1)若b=2,且h(x)=f(x-1)-g(x)存在单调递减区间,求a的取值范围(2)a=0,b=1时,试判断f(x)与g(x)图像的公共点的个数并说明理由在明天12点以前要看,
已知f(x)=ln(x+1),g(x)=1/2ax^2+bx,(1)若b=2,且h(x)=f(x-1)-g(x)存在单调递减区间,求a的取值范围(2)a=0,b=1时,试判断f(x)与g(x)图像的公共点的个数并说明理由
在明天12点以前要看,
已知f(x)=ln(x+1),g(x)=1/2ax^2+bx,(1)若b=2,且h(x)=f(x-1)-g(x)存在单调递减区间,求a的取值范围(2)a=0,b=1时,试判断f(x)与g(x)图像的公共点的个数并说明理由在明天12点以前要看,
1.
h(x)=f(x-1)-g(x)=lnx-(1/2)ax²-2x,x>0
h'(x)=1/x-ax-2=-(ax²+2x-1)/x
i)当a=0,h'(x)=-(2x-1)/x
知x∈(1/2,+∞),h'(x)
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