题目

Adult Basic Education (ABE) Preparation Task The ABE Department serves a huge population of learners. Our task is to teach basic skills and help learners to get more knowledge to function effectively as a family member, citizen, worker, and lifelong learner in a changing world. Description ABE Is a non-credit program of self-improvement designed to improve basic skills for students who are of different educational levels. Development of reading, writing, and math skills are paid special attention to, as well as life skills, employability, and technology. Students without a high school （本小题满分12分）. 已知中心在原点的双曲线C的一个焦点是一条渐近线的方程是   （1）求双曲线C的方程；   （2）若以为斜率的直线与双曲线C相交于两个不同的点M，N，且线段MN的垂直平分线与两坐标轴围成的三角形的面积为，求的取值范围.