Hello! My ____ name is John. My last name is ____. I am 12. I'm in China. My telephone number is ____. I have a good friend. Her first name is ____. Her last name is Read. She's 13. She is in America. Her telephone number is ____.
下面漫画《拆》告诫我们( )
(Ⅰ)设h(x)=f(x)﹣g(x),求h(x)的单调区间;
(Ⅱ)若存在x0,使x0∈ a+b4 , 3a+b5 且f(x0)≤g(x0)成立,求 ba 的取值范围.