2022英语周报八年级深圳专版答案

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!

21.解:作出可行域如图阴影部分所示,可求得A(3,4),B(0,1),C(1,0),(1)平移直线x-y=0,过A(3,4)时z取最小值2,过C(1,0)时z取最大值1∴z的最大值为M=1,最小值为m=-2∴M-m=1-(-2)=3.(6分)(2)直线ax+2y=z仅在点(1,0)处取得最小值,由图象可知-1<-a<2,解得-4

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