题目

A Language Programme for Teenagers  Welcome to Teenagers Abroad! We invite you to join us on an amazing journey of language learning. Our Courses  Regardless of your choice of course, you’ll develop your language ability both quickly and effectively. Our Standard Course guarantees a significant increase in your confidence in a foreign language, with focused teaching in all 4 skill areas----speaking, listening, reading and writing. Our Intensive Course builds on our Standard Course, with 10 additional lessons per week, guaranteeing the fastest possible language learning (see table be已知a、b、c分别是△ABC的三边长，当m＞0时，关于x的一元二次方程c（x2+m）+b（x2-m）-2max=0有两个相等的实数根，试判断△ABC的形状．