2022 英语周报 七年级 新课程 3答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

19.解:(1)由已知得a≠0,则b0,∴b=0,于是a2=1,解得a=1或a=-1根据集合中元素的互异性可知a=1应舍去,因此故(2)可分下列三种情形若只有①正确,则a≠2,b≠2,c=0,a=b=1,这与集合中元素的互异性矛盾,只有①正确是不可能的;(7分)若只有②正确,则b=2,a=2,c=0,这与集合中元素的互异性矛盾,只有②正确是不可能的;若只有③正确,则c≠0,a=2,b≠2,(11分)∴100a+10b+c=100×2+10×0+1=201.(12分)

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