彐命题愈图本考查导欲、极值、最侦,恒成立以及证明数列不等式等间题,主要考查学生的逻辑推理能力、运算求解能力及转与化归惑想、分类讨论恳想考查的核心素养是逻铒推理、敬学感思路1)由题意知f'(x)x≤0且f(0)听以f'(0)=a-1若a=],则f(x)=ln(x+1)-x,x∈(-1,+当-1 0,f(x)单训递增当x>0时、(x)<0,f(x)单调递减(3分)所以x=0是fx)的极大值点也是最大值点,故fx)≤f(0)=0综上(2)由(1)知fx)=ln(x+1)-x≤0所以当m≥0时,mf(x) -在x∈(0,+)上恒成立刚g'(x)=则“x∈(0,+∞)时,g'(x)>0,则e(x)单调递增所以g(x)>g(0)=0,此时符合题意)时,(x)此时不符合题意综上所述,若对任意的x∈(0,+x),有mf(x)

书面表达One possible versionI求Dear PeterI heve good news for you Our school Food Club will hold a dumpling- making activity. As you're interestedin Chinese food, I'm writing to invite you to join in the activity with me.As a kind of traditional Chinese food, dumplings are very popular during festivals, especially in the SpringFestival, when people will get together to make dumplings. The activity will begin at g am next Saturday in theschool canteen. First, (chefs) will teach us how to make dumplings step by step. Then, there will be a dumplingmaking competition in groups. Finally comes the most exciting part--enyoying our dumplings.Looking forward to your coming.Your

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