ߡ𡭡 ߡ𡭡
18PABCDĵΣ PO?ABCDOE ֱAD,ABе㣬 AB?6,AP?5,?BAD?60?.
___________š______________________װװ___________:Уѧ𡭡ڡ𡭡֤ AC?PE
ֱPBƽPOEɽǵֵ
IIIDCǷڵFʹBFPAɽǵֵΪ3310ڣȷFλãڣ˵.
19ijֲ浾AӽB浾AĶȶΪ500굥Ϊ3.50Ԫ굥۲ĿΪ10%Ϊ3.60ԪĿΪ60%Ϊ3.70ԪĿΪ30%ͳӽBĶݣõĶƵʷֱֲͼ£ͳƽ10ӽBĵۣλԪ/ֲĶλĶĹϵõ10ݼΪ?xi,yi??i?1,2,L10?õɢͼ£οݼ£
1곣浾Aĵƽֵ
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ߡ𡭡
2ƵʷֱֲͼУȡֵмֵ㣬ӽBĶƽֵƵΪʣԤƽж꣬ӽBĶ765ĸʣ 3жӽBĵyλԪ/ֲĶxλĶǷأأԸµIJοyxԻع鷽̣֪˵ӽBֲĶԤΪ2Ķڳ浾AӽBѡֲˮߣ
ͳƲοݣx?1.60y?2.82
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2FĵֱlCA,B㣬A,B㴦߷ֱxP,Q㣬AP?BQȡֵΧ. 21֪f(x)??x2?a?lnx. 1a?0ʱf(x)Сֵ 2f(x)??1?e2,?????ֵx1,x2?x1?x2?. iʵaȡֵΧ ii֤?2e2?f?x2???12e. 22ֱϵxOyУֱlIJΪ??x?3?tcos?y?3?tsin?tΪ.
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?2?2?cos??3.
1Cֱ귽̣˵Ǻߣ
2PΪ?3,3?ֱlCAB㣬PA?PBֵ. 23֪f(x)?x?3?mx.
1m??2ʽf?x??5Ľ⼯
2xIJʽf?x??1RϺʵmȡֵΧ.
Ծ6ҳ6ҳ
𡭡ڶߡװڡװҪװ롭𡭡⡭𡭡ϵͳԶɣϸУԺʹã𰸽ο
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1B
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z?1?i???2?3i??1?i???1?5i
ิz?1?i?ڸƽڶӦĵΪ??1,5?ڵڶ. ѡB. 㾦
˸ʽij˳㣬˸Ĵʾ伸壬ڻ. 2D
ɵõN??0,1,2,3?ɼϵĽõ. ⡿
M??x|?2?x?3?
N=x?Zlog5?x?1??1log5?x?1??log55?0?x?1?5??1?x?4.
Ϊx?Z,N??0,1,2,3,4?ʵõ M?N=?0,1,2?. ʴΪD. 3C
P?90?X?105??⡿
??3˴ѧԳɼ90ֵ105֮ 10𰸵1ҳ24ҳ
ϵͳԶɣϸУԺʹã𰸽ο
P?X?90??P?X?120??P?90?X?105??123P?90?X?120??1?? 5553 103?300 10Դ˴ѧԳɼ90ֵ105֮ԼΪ1000?ѡC 㾦
СҪֲ̬ߵص㼰ʾȻ֪ʶν˼룮ڻ⣮ 4A
SʽԼθеͿɵP(A)?㼴.
SԲ⡿
ʽɵã
?1?332S?3?r2?sin60???r
4?2?2SԲ??r
ɼθеͿɵã
332rS33
P(A)??42?SԲ?r4?ѡA. 㾦
˼θеͼεʽڻ. 5B
˫ߵļʣתƳabcĹϵȻ˫ߵʼɣ ⡿
𰸵2ҳ24ҳ