英语周报2018-2022七年级下册第39期答案

第二节书面表达Dear JimmyIs everything going smoothly with you recently? Testrengthen our understanding of Chinese culture. ourschool will hold a talent show about traditional Chinesefestivals. The reason why i write the letter to you is that iwant to invite you to take part in it.le competition will be held on the stage set up onhe playground in our school on the morning of may 16when all the teachers will be present. Youd better presentyour favorite dance to show your understanding of oneChinese festival, which not only provides you with thechance to prove your talent, but it will also help you winthe support of the judgesHoping that you can take part.Yours.Li h

∵a=(3,2),b=(2,x),∴a+2b=(7,2+2x),a-b=(1,2-x).又∵(a+2b)⊥(a-b),∴.(a+2b)+√23(a-b)=(7,2+2x)·(1,2-x)=7+(2+2x)(2-x)=0,解得x(舍去)

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