A:appearance
B:meaning
C:confidence
(Ⅰ)求a的值;
(Ⅱ)若对于任意的x∈1,+∞),f(x)≤m(x﹣1)恒成立,求m的取值范围;
(Ⅲ)求证:ln(4n+1)≤16 ∑i=1ni(4i+1)(4i−3) (n∈N*).