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1999ԭ۲θ۵ĸܾԭ۲ĸ۵ĸޱΪ۲κãչľƶйԱѵƻƻ涨ԱѵΣһڴڼ䣬һΪ·һڣÿʱ35졣еԱȡйعۼ֪ʶĽͱ棬ٽϹ˾ʵʽۡÿζƸһЩרҹʲμӽۡÿ꼯ѵεķòÿ40ˣֻ10ԪѵЧȴܴ
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£۵ĸܾ۲֣ǷӦԱѵϽּۻܾۡνԱԭһεѵĿΪһΡޣĿǰžϵѣһϣͨüԱ֧ǹ˾ءĿǰ40λԱתԱܲüôʣµһ·ѵĿˡĿǰԱǽнĴѧҵѧУѾѧ۷֪ʶЩ˶ѵȤҲܴһЩԱ䲻ǴѧҵǶ۷˷ḻľˡҴˣΪԱѵĿDzҪĿ֧ȡ
شǴԱǽĴѧҵǣҪ֪ڴѧѧֻ鱾ϵ֪ʶͳĸңרҵԵĻױƷͱƷûκξ顣ѵУôѧУоԱһһʱڣʵ۹⣬ڴ˻ٲμǵѵһȡйۼ֪ʶĽͱ棬һ߽ǹ˾ľʵרǹͬ֡ǼֲиؽѵDzڹںгǵҲżٹ˿ͶǵıԹӮ˹˿͵ˣΪǾѵĿ
ԲޡܾҪDZ֧ûа취Ҷ˵ˣأDzܲüԱԣֻͨԱѵƻ֧Ҿ꿪ʼÿεѵĿΪһΣ֮Աѵ5060Ҳȹ˾ľúתԺٿǷָԱѵ⡣
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ΪĿ꣬ѧԺƻδڳΪѧȻݹҽ涨ҪΪѧУغͽѧ豸ﵽ涨⣬ҪǶʦʱҪѧУǿʼأµĽѧ¥УᣬµĽѧ豸Ӳ豸Ŀһжչ˳Ȼʦ˲ŵĹ滮ϣҪרҵʿԼɱķʽӹ滮
ڸѧԺǰĸרתͳѧԺΪʦƸʵʿ˶ѧֻҪڴѧϣԹȥʦʽṹ̺ͽʦӶࡣ
Ŀǰ涨ҪΪѧٱҪ40%ʦϵʦʡΪУԱϼ쵼ָҪĿǰУʦһļƻΪһ꣩ʹУڵʦ֮ɿѧżСAʼռϣÿ̽˵2ˡ⣬УڴԼ45λڽʿÿܱҵԤΪ3ˡ
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1ڽʦϵʦнʽϸߣڵһڶѧУҵʦʣһ㶼ӦڵļԴʦҪˮƽ
2
1 ʦʵı仯õʦ
ʦʲ㼶 ѧҪ һ ڶ
ʿҵ ʿҵ
ѧ 2 0.4% 2 0.5% 2 66%
˶ʿ 272 67.32% -2 -3 267 66.75% -2 -3 262
ʦ ʿ 110 27.22% +3 113 28.25% +3 116 34%
15 3.71% 15 3.75% 15
5 1.24% 1.25% 5
404 100% 402 100% 400 100%
2ļʦϵʦ
ļʦϵʦΪxx136÷400x=40%
ļʦϵʦΪ x = 40ˣ