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,
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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