题目

等腰两边的长分别是一元二次方程的两个解，则这个等腰三角形的周长是_________ 答案：【答案】7或8【解析】试题解析：解方程x2-5x+6=0得x1=2，x2=3，当2是腰时，2+2＞3，可以构成三角形，周长为7；当3是腰时，3+2＞3，可以构成三角形，周长为8；所以周长是7或8． One day，a man telephoned Norman Vincent Peale．He was in great depression （沮丧，意气消沉）and told Morman that he had nothing left to live for．Peale invited the man to his office．“Everything is gone，and I'm hopeless，”the mall told him．”I'm living in the deepest darkness．In fact，I've lost heart for living altogether．’’     Norman Vincent Peale smiled sympathetically（同情地）．”Let’s take a look at your situation，”he said calmly．On a piece of paper he drew a straight line down the middle．He suggested that they list on the left side the things the man had lost，and on the right, the things that had been left．”You won't need that column（栏；列）on the right side，”said the man sadly．”I have nothing left．” Peale asked，”When did your wife leave you?”  ”What do you mean? She hasn't left me．My wire loves me!”     ”That's great said Peale enthusiastically（热情地）．”Then that will be number one in the right-hand column：Wife hasn't left．Now, when were your children put into prison?”     ”That's a silly question．My children aren't in prison!”     ”Good! That's number two in the right-hand column：Children not in prison．”said Peale，writing it down． After a few more questions in the same column，the man finally got the point and smiled in spite of himself（不由自主地）．”Funny，how things change when you think of them that way．”he said． 1．The author suggests that ________________．     A．we should ask for help when we are in trouble     B．we should think of the things in a positive（积极的）way     C．people in depression need understanding     D．we should stop people who want to die 2．The man had lost heart for living because ___________．     A．his wife had left him     B． he had lost everything in his life     C．he only thought of the dark side of his life     D．he was suffering from the disease 3．Peale drew a straight line on a piece of paper to ____________．     A．show the man how to divide a piece of paper     B．help the man analyze（分析）his situation     C．make a list of things he needed to do     D．show his kindness 4．We can infer（推论）that the man in depression finally __________．     A．went home happily     B． filled the left column with bad things     C．left the office angrily     D．killed himself 5．How many things are written down on the left side of the column?     A．One．                 B．Two                    C．Three．                  D．None．