题目

等腰三角形的周长为18. （1） 已知腰长是底边长的4倍，求各边长. （2） 若已知一边为8，求其它两边长. 答案：解：设底边长为x，则腰长为4x， ∵三角形的周长是18， ∴x＋4x＋4x＝18， ∴x＝2， ∴4x＝8， 故三边长分别是2，8，8； 解：当腰长为8时， 由（1）可知三边长分别是2，8，8， 2+8＞8，符合三角形的三边关系定理， 故此时其它两边长为：2，8； 当底边长为8时，则腰长为：(18-8)÷2=5， 三边长分别是5，5，8A man was driving at 70 miles in a 40-mile-zone, when a police car came behind him with the light on. __1__. As the policeman came to him, he said,” Hi, officer, I guess you caught me a little bit over the limit. I was in a rush to get home, to be with my wife and kids, you know my younger son wasn’t feeling well when I left home this morning.” The policeman said, “Well, I guess so,” and started writing something in his notebook.__2__. A few moments later, the policeman came to his window and handed him a paper, and returned to his car without saying a single word. The man started to wonder, how much this ticket was going to be as he began to look at the paper.__3___ But something which read: “I had a daughter who was killed by a speeding car at the age of six, by a speeding driver like you. He got a fine, a few months in prison, and was free, free to hug two other daughters.__4__ I have tried to forgive that man a thousands times, and I thought I had. Maybe I really forgive him, but I have to do it again, even right now.__5__.” The man was very surprised and could not move for the next few minutes. When finally he did, he drove slowly, even a few miles under the speed limit, praying for forgiveness.A. So pray for you, and be careful when you drive again, your daughter is all you have left.B. I only had one, and now I had to wait I go to heaven before I can hug her again.C. Right away the man started thinking of excuse to give.D. He was surprised it was not a ticket. E. So pray for me, and be careful when you drive again, my son is all I have left.F. As minutes went by, he hadn’t asked for his driver’s license.G. He was surprised it was not a ticket as he began to read.