已知函数,. (Ⅰ)若对任意的,不等式恒成立,求实数的取值范围; (Ⅱ)如果当时,关于的不等式在实数范围内总有解,求实数的取值范围. 答案:Ⅰ)已知对任意,恒成立,则, 即对任意,不等式恒成立. 令,当时, 所以在上单调递增, 函数有最小值,最小值为, 所以,解得; (Ⅱ)因为,所以 因为,所以 由 所以时,函数单调递减, 时,函数单调递增, 所以 因为不等式在The landscape photographer is _______ the lighting conditions that are present at the time of the shoot.A.at the expense ofB.at the risk ofC.in the way ofD.at the mercy of