题目

Mountain regions are not just playgrounds for the richer citizens on the planet, however. The disappearing snows of Mount Kilimanjaro are a worrying sign that nowhere is safe from the adverse effects of human actions. The United Nations has identified three main areas that need to be addressed to ensure the future safety of the world’s mountains. These are: the protection of mountain ecosystems, the encouragement of peace and stability in mountain regions, and assistance for mountain people to maintain their ways of life.From the busy cities of India to the farmlands of California, more than（2000•宁波）已知方程x2+2x-3k=0的两个根分别是x1和x2，且满足（x1+1）（x2+1）=-4，则k的值为11．