2019～2022英语周报8年级下答案

16.士√3【解析】设圆心O、点A到直线l的距离分别为d1,d2,则d1=根据√1+k1+k∠BAC=60°,可得∠BOC=120°,则BC=√3,∴S22× OBX OCSin∠BCC=2×1×1xsn120√3×1|√31+k解得m×3×-1m/1+k413当m=2时,由2ky3,解得4=1+k2,此时方程无解;当m=-1,由321+k2=2,解得k2=3,k=士3.

第二节One possible versionDear mr. smithIm writing to ask for a three-day leave, for I can'Iattend your English classes from Monday to Wednesday nexOwing to a severe headache, I have made an appoint-ment with a specialist. and my mother will take me to seehim. It's a great pity that I will miss your interesting lessons but I hope you will excuse my absence. I promise tomake up for the missed lessons after I return to school.Your kind permission will be greatly appreciatedYeLi Hua

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