2021-2022英语周报高一答案22

22【解析】(1)当a=45°时,直线1的参数方程为(t为参数√2消去t得直线l的普通方程为x-y 1=0曲线C的方程为P=4sin9,所以p2=4psin0,即x2 y2-4y=0整理得曲线C的直角坐标方程为x2 (y-2)2=4(2)将为参数整理得2-2sina·t-3=0,易知△>0,设方程的两根分别为t1,t2A / t2=sina,t1t2--3所以|AB|=1t1-t21=√(t1 t2)2=41t2=√4smna 128分当sin2a=1即a=时,AB取得最大值为4当sin2a=0即a=0时,AB取得最小值为2.…

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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