(1/2)ҳ
һԵҶûѧϰͱҶӵһߣʮȦӴҶŲأһѧԺʦѲɻҴȲ
ֵܣ˲ʵ
˼ථˣֻǾжĻͲһˡӳЩȻİٺϵĻȽϼӳɻЩȷ
Ҫɣ˵
ӳɣѾС̶ֳһѧԺʦȻ˺£ѹһֱҲڽ¡һԱȻӳɣҶЩĵij
ɵ˭ȻôšͬҶĻǰʶҶСѯʵ
Ҷӳɷdzƽ˵
ҶԼͷѲɾǰĸҶ
ԣûӳɵ˵ͷͬΪˮӳôܲʶҶҶ£Լ˵ӳɻ϶ʶ
˵ÿһ߶һ˼ҵĺӵĻôӳߵı˼ҵĺӾҶ۴һ棬Ҷ걬ӳɵĴڣѧʶΪ³࣬cdҶ
ҲˣҶӳɲϵǵжԵģҶĻҲͽ͵ͨˡ
˵ľôоһЩ
ΪıˡӳdzСĽһҶdzνʼ磬аɣҵСҵСɣôΪôΪɡ
ǰɵ˷ʱ䣬ӳɾԼʱȥϰʲôģʹħͷвѾҪˡ
ǸСųҺܿ㡱ӳԵӣʵҲطҶֱŭǰӳȫͶΪӵܵϣȻһʦ
ɵʲô̼𡱰üͷʵ
˵DZħͷŰˡӳֹһȻľȾͱˡ
ӳɵõϢ˵ҶڶijIJʱһаεʲôΣǴħͷΣȻħͷŰһľͱˡ
ľţΧľͰľ壬һˣôΪ϶ֱˢˢ½
ҶΪħͷŰһξͱľӳɾͲҶɶˣŰһξͱ˵ô䵱ӳɵĶ֣
(1/2)ҳ,һҳĶ
ǩĶ