2023～2023八年级下册英语周报20期答案

2023～2023八年级下册英语周报20期答案,我们目前整理分享关于2023～2023八年级下册英语周报20期答案及其参考答案,2如需答案 请关注微信公众号：趣找答案/直接访问www.qzda.com(趣找答案)

22.解析:(1)由r2cos20=1得r2cos36-r2sin26=1,所以曲线C的直角坐标方程为x2-y2=1x=t+√3,由消去t得3xy-3=0,所以直线l的普通方程为3x-y-3=0.=√32分u+3(2)点M在直线上,直线/的参数方程可化为标准形式:(t为参数),(4分)设点P,Q对应的参数分别为a1,2,将直线的参数方程代入x2-y2=1,得2-3/3-4=0,所以u1+u2=2/3,12=-4,………………(6分)MPMQ7×-1=au2√(3/3)2-4(-4)(10分)uiu24

书面表达OnepossibleversionDearMr.SmithI'mLiHua.chanwritingtoinformyouthatanEnglishspeechcontestwillbeheldthelecturehallnextFridayandwewouldliketoinviteyoubeoneofthejudgesofthecontest.Thespeechcontestwiththetheme""StopwastingFood""isintendedtoarousestudents'awarenessofreducingfoodwasteandasenseofresponsibilityWewillgreatlyappreciatcitifyoucouldacceptournvitation.Lookingforwardtoyourreply.ua