题目

选择合适的单词完成短文。每词限用一次。 took climbed food saw older sang happy old mountain had Yesterday I a mountain with my cousin, Tom. Tom is 13 years .He is one year than me. We took some and drinks with us and Tom took his camera, too. On the mountain, we took a lot of pictures of the beautiful scenery. When we got to the top of the , it was 1:25 p. m. We and danced there. We got tired. But we felt very , because we some squirrels and many pictures. We a good time.、已知函数f(x)=6x–6x2，设函数g1(x)=f(x), g2(x)=f［g1(x)］, g3(x)=f ［g2(x)］,…gn(x)=f［gn–1(x)］,… （1）求证:如果存在一个实数x0，满足g1(x0)=x0，那么对一切n∈N，gn(x0)=x0都成立； （2）若实数x0满足gn(x0)=x0，则称x0为稳定不动点，试求出所有这些稳定不动点； （3）设区间A=（–∞,0）,对于任意x∈A，有g1(x)=f(x)=a＜0, g2(x)=f［g1(x)］=f(0)＜0， 且n≥2时，gn(x)＜0  试问是否存在区间B（A∩B≠），对于区间内任意实数x，只要n≥2，都有gn(x)＜0.