题目

   We have talked about snails(蜗牛) and their slow move. But much of the time nails don’t move at all. They are in their shells--- sleeping.    Hot sun will dry out a snail’s body. So at the least sign of hot sun, a snail draws its body into its shell. A snail will die in a heavy rain. So when it rains, a snail does the same thing, too. A snail can sleep for as long as it needs to. It spends all the winter months in its shell, asleep.    In spring the snail wakes up. Its body, about three inches long, comes out of the shell. When hungry, the snail looks for food. Its eyes若函数f（x）=4×9-|x-2|-2（P-2）×3-|x-2|-2P2-P+1在区间[2，+∞）内至少存在一个实数c使f（c）＞0，则实数P的取值范围是 ．