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ͶӰĸõ߶Ϊʲôָԭ߶ι,Ƿ,ͲڸͶӰ

ͶӰӰĸ?Ϊʲô?ش𣺡ӰͶӰ ͶӰ,з

ԭӵĵӹǶȷֲͶӰͼΪʲô?شΪԭӹֲͼǽѦ̷̵õIJ׵ֵֵֿΪΪγɹ

ͶӰûͶӰûšͶӰһ߶εľֵ,ֻ䳤ȵĴСûз,ûšͶӰĸ:

ѧͶӰûиֵ?2 ش۵(Ϊʲô?) ֪ͻ ֪ʶͼ άͶӰΪά? 9 ش dάռ౻n

ͶӰ֮?ͶӰ,Ӱ,ϣܸͶӰӰͬļнǵʱ,ͶӰļнǶ۽,ͶӰǸļнֱ,ͶӰ0

ͶӰǸֵ?a,b,abнΪ,abϵͶӰΪaģcos,ΪнǷΧ[0,pi],,Ϊʱ,ֵ

ԭӵĵӹǶȷֲͶӰͼΪʲô?γɹۼʱҪͬص,ԳƥԭȻƽǶȷֲͼDz׵ƽ,ֻ׵ƽӳֵļʡ

ͶӰ,ҲǸ,ôӰҲǿɸ赥λeֱmķ,AB=a,AֱmϵӰA',BֱmϵӰB',A'B'ABֱmϻ

ͶӰdz,dzΪиֵ?ΪβֱߵͶӰ,ֱγ,ôͶӰΪ,γɶ۽,ͶӰΪ,γֱ,ͶӰ

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