õڶʤҲȥԵ飬˼Լúȥδӡ
ʤҲûбҪȥƲΫԽһҲܴȥҲǸġοѾǶΫˣܣ̷˿˲á
Ȼм־ѧȴһͽûڣֻԼڣżһĵӴ²ʤҲԼܽƳɣҲѧţټ¿ҲãȥԵŹɣںµԶΣǶΫĵӣ̺ǰãʤǶԶУҲûʲô˵
һɱ˴ӣնɱ˼ҵļҲת˵ڲסߣʦǽ̾Σһƭµ¶һٴҲԩЩ¶ʤƵûȻʤڻ֪鳤ӣڤʮƪҲϵľ
ҲգҾͳȥ˵һʲôԵ⣬˵еҲ˵ϹҲȻڻȥҲҰүθڡպֹʤͷɣԿʼӴӷҡ
ӵķңһƽ֯͵ĿڴߵƤҿҪࡣ
ӱϾǸòŮӣ*ʶҳϽ֮⣬ò֪ʲôȸëڷһͷĴĵš
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ʤDz֪нĵɫʩ˻ȥҲ࣬û뵽˰ʤӣƮҲ֪Ŀ
ռķ࣬DZȴðʤϲֻһɶݵĴơ˱ȴǷĴеİڵĶŷһԻİڵӣ͵͵˱ķ˺ЩŴ˲ϣƳƽʱϲ˼㡣Ϊ˱ʱһشӢʶɫ̣ʮֺÿӵԼҵƣƬҲһȴһʮСᦣĸͷ͵ģʤһʱҲϲ֪÷ֻҷŹֻðʤϲðʤϲ⣬֮ϲȴǴӵķеһϺõķɽ
ʮһҷ(1/2),һҳĶ