题目

已知y与(x-1)成正比例,当x=4时,y=-12. (1)写出y与x之间的函数解析式. (2)当x=-2时,求函数值y. (3)当y=20时,求自变量x的值. 答案： (1)设y与x之间的函数解析式为y=k(x-1), 因为当x=4时,y=-12,所以-12=k(4-1),解得k=-4, 所以y与x之间的函数解析式为y=-4x+4. (2)当x=-2时,y=-4×(-2)+4=12. (3)当y=20时,20=-4x+4,解得x=-4.根据短文内容及所给提示，补全文中单词或用所给单词的正确形式填空。Do you know Mo Yan and Tu Youyou? They are 1. (success) in their fields. Mo Yan is a w2.. He has written many books. He won the 2012 Nobel Prize for Literature. Tu Youyou is well k3. for her discovery of artemisinin(青蒿素). It is used to treat 4. (ill). And it can help 5. (solve) many medical problems. Because of her great contribution, she got the 2015 Nobel Prize for Medicine. They are the pride of China. 1.successful 2.writer 3.known 4.illness 5.(to) solve 【解析】试题本文介绍了两位诺贝尔获奖者——莫言与屠呦呦，他们各自在自己的领域里获得了巨大成功，他们是中国的骄傲。 1.句意：他们在自己的领域里很成功。success名词，成功；successful形容词，成功的。be+形容词，在句中构成系表结构, succe...