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

21解:(1)将x=c代人椭圆方程C:+221(a>b>0)中,b2可得y2=一,所以弦长为故有{c3解得u2=b'c所以椭圆C的方程为+y2=1.分)(2)设点P(x0,y0)(y≠0),因为F1(-√3,0),F2(√3,0),所以直线PF1PF2的方程分别为l1:yox-(x+3)y+0l2:y0x-(r-√3)y-3yo=0由题意,得lmy。+√3y。||myn-3y+(x0+√3)√y2+(x。-3)(8分)因为点P为椭圆C上除长轴外的任一点,所以x+y3=所以—1m+√3m-√3+2)因为-√3

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