已知：1a+1b=6，那么a-3ab+ba+12ab+b的值为______． 发布时间：2017-05-18 21:21 │ 来源：www.tikuol.com 题型：填空题 问题： 已知：1a+1b=6，那么a-3ab+ba+12ab+b的值为______．
题型：填空题 阅读理解。 "I don't see why I can't be the best person to write an advice column for the students called Dear Amy!" Andy said to Jenny, the editor of the school newspaper. Andy agreed to do it if Jenny did not tell it to anyone else. At first it wasn't too bad. Most of the letters he received were interesting and quite easy to answer. Then came a letter from a person named Joe. "Dear Amy," it began. "I'm in real trouble. I've wanted to be a songwriter all my life, but my parents won't even let me take music lessons .I have a guitar, but they both get angry if I play it, I've tried explaining, but theywon't listen. I feel sad. Should I run away from home? Maybe that will make my parents change their minds! "The letter was written by "Joe". Andy thought about this letter for a long time. Should he advise someone to run away from home? But didn't Joe have a right to be a songwriter if he wanted to? Andy thought hard but couldn't think out a good answer. Andy couldn't sleep . He just worried about poor Joe. In a reading room a few days later, Eleanor, a girl in Andy's maths class, sat down next to him and said, "You look a little bit worried" "I guess I do." Said Andy. "If you've got a problem, why don't you try writing to Dear Amy about it?" asked Eleanor. Andy groaned, but she went on."I guess Dear Amy is rather busy with other problems. She still hasn't answered the phoney letter I wrote her last week .You'd better read it — it may make even the most hard-hearted person cry! It was thought to be from a songwriter named Joe." 注： advice 建议，column 专栏，editor 编辑，guitar 吉它，explain 解释， right 权力，groan 呻吟 1. From the first paragraph we can see that ________.[ ]A. Andy can't be the best person to write an advice column B. Andy wouldn't like to do the work for the school newspaper C. Andy didn't agree to do the work for the school newspaper D. Andy would like to do the work for the school newspaper 2. In the story, it seemed that ___________.[ ]A. Jenny could not answer the letter from Joe B. Joe was in real trouble and needed help C. Eleanor had made great trouble for Andy D. Andy had changed his name to Amy. 3. The meaning of the word "phoney" in the last paragraph is _____________.[ ]A. rather difficult B. not real C. very strange D. quite short 4. The writer of the story mainly wants to tell us ______.[ ]A. a joke B. about Andy' work C. a story about Joe D. about a school newspaper 查看答案
题型：填空题 已知：① A+ B2+ ＝ A2++B ，② D +2H2O ＝ D(OH)2 + H2↑，③ 以B 、E为电极与E的盐溶液组成原电池，电极反应为：E2++2e-＝E ，B-2e-＝B2+。则A2+、B2+、D2+、E2+ 的氧化性强弱关系是 [ ]A．D2+>A2+>B2+>E2+ B．E2+>B2+>A2+>D2+ C．D2+>E2+>A2+>B2+ D．A2+>B2+>D2+>E2+ 查看答案