chuī rù chí piāo shuāng luò
飘____ 霜____ 吹____ 落____ 入____ 池____
Mr Li is a doctor.
He goes to work at eight o'clock ____ ____.
(Ⅰ)求a,b的值;
(Ⅱ)若f(x)有极大值28,求f(x)在﹣3,3上的最小值.