英语周报 2018-2022 高考 HZ 答案

Dear TimHow are you recently? Last week, our school held a tug-of-war on the playground. Theactivity was held to enrich the lives of students and raise the awareness of team spiritThe activity began with a tug-of-war between Grade 1 and Grade 2. Then came the tug-of-warbetween Grade 3 and Grade 1. Finally, there came the tug-of-war between grade 2 and Grade 3. Allthe students taking part tried their best to pull as hard as they can while other students presentcheered them up. After that, the headmaster awarded the winning group.From the activity, we realize that if we want to win. we should unit as one. Moreover, we hopemore activities like this will be organized in the future.Yours

17.(本小题满分12分)解:()函数对)一x9) c3x-1smnx308x m o2x-NE Sin xcos? I sin cos - 3sIn x cos x -cos"xsin 2x -cos 2x) 42sn(2x x)14.3分xE-x,0,所以一丌2x ≤,:-1≤sm(x )s1,当2xm3时,即当x=-x时,函数f(x)取最大值6分(2)由题意f(4)=sm(24 2) 1=1,化简得sn(24 2)=,∵A∈(0,x)2A z∈(.13z),∴2A 丌5丌解得A在△ABC中,根据余弦定理,得a2=b2 c2- bc cos-=(b c)2-3bc由b c=4,知bcs2)=4,即a24当=c=2时,a取最小值为

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