题目

阅读理解 When introducing American universities,some of the first institutions to mention are the Ivy League schools.Originally, the Ivy League was an athletic conference made up of 8 privateinstitutes of higher learning in northeastern United States. However, as timewent on, these schools also became known for their excellence in academicsbesides athletics. Included in the Ivy League schools are Brown University,Columbia University, Cornell University, Dartmouth College, PrincetonUniversity, University of Pennsylvania, Yale University, and HarvardUniversity. These 8 schools have been reco22、方程2x2+x-1=0根的判别式的值是9．