题目

与它倒数的积是________，0.45的倒数是________． 答案：1 分析：互为倒数的两个数的乘积是1；先把小数化为分数，再运用倒数的求法解答．解答：与它倒数的积是1；0.45=，的倒数是．故答案为：1；．点评：此题考查倒数的意义和求法：乘积是1的两个数互为倒数，一般在求小数的倒数时，先把小数化为分数再求解．14．假设你班为促进学生素质的全面发展，最近以"当班干是否会影响自己的学习？"为题进行了一次讨论．许多同学认为当班干不会影响自己的学习，但也有一些同学认为当班干会影响自己的学习．请你根据以下表格中的内容要点提示，用英语写一篇短文．乐观者的观点1．当班干不会影响学习；2．学习好的关键因素：…（自拟理由）3．当班干还会有利于你的学习提高：…（自拟理由）担心者的观点1．当班干会影响学习；2．当班干就不会有足够时间学习：…（自拟理由）3．学习会掉队．你自己的观点…（自拟观点和理由）要求：1．词数100个左右，开头已给出，不计入总词数；2．所写内容必须包括表格中的所有的信息，并作适当的发挥；3．不得出现真实的人名、校名、地名等相关信息．（参考词汇：掉队 fall behind，自信心 conference，关系 relationship）Is it good to be the class leader？Does being a class leader affect（影响） our studies？Different students have different opinions（观点）．Some students think being a class leader doesn't influence our studies．If we want to do well in our studies，we must listen to the teacher carefully and do some exercises to practise．And being a class leader doesn't harm either of these．Class leaders are always better at studying than other students．They need to set a good example to others，so they always try their best to make progress in their studies．However，some others think being a class leader affects our studies．As a class leader，we don't have much time to study．We need to help others to study．And we need to spend a lot of time keeping order．Then there is not much time for ourselves．We will fall behind．In my opinion，being a class leader at school doesn't influence our studies．It's a good chance to improve ourselves．．