题目

Here are some American classroom rules:◎If the teacher asks a question, you should give an answer. If you don’t understand the question, put up your hand and ask the answer.◎There is no excuse for not doing your homework. If you miss a class, you should call and ask for the homework.◎You shouldn’t miss a test. If you are seriously（严重地） ill, call and let the teacher know you will not be there for the test. If your teacher allows make-up tests, you should take the test in one or two days after returning to class. Serious illness is the only reason for missing a test.◎Be on 解方程：(8分)　　(1)2x2-4x-5=0　　　　(2)(x-2)2=(2x+3)2