江淮名卷·2022年安徽中考押题卷(三)3语文试题答案

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10.ABC【命题意图】本题考查椭图和双曲线的定义、标准方程、离心率等，考查数形结合思想，体现了数学运算、直观想象等核心素养，【解析1设椭圆C,的方程为+后=1(m>n>0),双曲线G,的方程为=1(a>0,b>0),焦距为2c,P是。2621曲线C,与C,在第一象限内的公共点.连接PF,PF2,则1PF,I+1PF2I=2m,IPF,1-IPF2I=2a,解得1PF,I=m+a,IPF21=m-a.由已知条件，得PF1⊥PF2,所以(m+a)2+(m-a)2=4e2.化简并整理，得(侣月侣)-2.266分别是自线G和G的离心率.因为=子所以号于是号后1弓则。=2水适项AB,C中的06不满足13该等式，故选ABC今名师评题本题的设间具有新颖性和开放性，体现了高考命题的新动向、新变化。试题能有效考查学生思维的灵活性、创造性和广阔性。对圆锥曲线的定义和几何性质的考查，一直是高考命题的重点和热点，本题同时考查了椭圆、双曲线的定义和几何性质，综合性较强，是一道较好的考题.

One possible version:Dear I im.I'm writing to tell you about the plan for your next Chinese lesson.We'll still meet at my school at eight next Saturday morning. The course will last alittle longer this timeI'd like to introduce Song poetry. These poems are popaamong Chinese peopllso attract lots of forergners. I believe you will love them100You' d better make preparations for it. so I suggest you learn about the brief histo-y of the Song Dynasty. which will surely help you better understand Song poetry.Yours.Li hua