ծȨ˿ԼϯծȨ˻飬 Ҳίд˳ϯծȨ˻鲢ȨʹȨ
ծȨ˻ϯ1 ɷԺָ ԺбȨծȨָծȨ˻ϯ Ҫʱ ԺָծȨ˻ϯ ծȨ˻ϯίԱᡣ
ЩڻбȨأ вƲծȨޱȨ ƲծȨծȨ˻ϲбȨ ծȨַΪ֣ һDZƲծȨˣ ծȨʱû ڶвƲծȨ˷ܳȨ ΪƲծȨ ծ˵ı֤˱֤ ȡôλծȨ ʱҲƲծȨ . ƲծȨô֣ ծȨ˷ һвƲծȨˣ һƲծȨˡ
ծȨ˻ϯʵֻǸ֯ߡ
һծȨ˻ծȨ걨ޣ Ʋ3 ޣ 15 ٿ Ժټ . һƲ5 1 棬 5 1 һ걨ծȨѾʼˣ ôծȨ걨ʱ3 ǾӦ8 1 ~15 յڼٿһծȨ˻顣 ԺڵһծȨ˻ծȨʸ ָծȨ˻ϯ ծȨ˻ְȨй ͨծ˾Ӫծ
ԺծȨ˻ڳ֮һʱٿ
һ ԺΪҪʱ
ڶ ծȨ˻ϯΪҪʱ
Ҫʱ
ģ ռƲծȨܶ1 /4 ϵծȨҪʱҲٿ
еһγֶٿծȨ˻飬 Dzڵġ ǰαȽϺ⣬ ξ˵һ£˵ ծ˵ծܶ 100Ԫ A B C D E5 ծȨˣ еծȨֱΪ A 20 B 35 C 25 D 10 E 10 . BڳծȨʱ˵ ôٿծȨ˻ʱֻҪծȨծȨռƲծȨܶ 1 /4 ϣ 65 Ԫ 1/ 4Ҳ16 . 25 ԪծȨ˻ͿٿֻǿծȨ ǿծȨ
ծ˵IJƲ֧ƲöǰսƲ⣬ һծȨ峥ΪΪɶȡծȨ˻顣ծȨ˻ְȨ棺
һ йծȨ֤ϣ ȷծȨƲ ΪծȨ˭ԸԼծȨвƲծȨΪծȨԵõٷ֮ٵ㣬 ǵDzǷϷɹ涨 Ϸɹ涨IJܳ ȨծȨ˻ʹ
ڶ ͨͽЭݰ ծҪծȨ˻ͽ⣬ ծ˱ͽЭݰ ύծȨ˻ۣ ͨʲôôͨʲô 漰ծȨ˵棬 ծȨ˻ϽгۣǷͨԴɺͽ⡣
㱨档
ģͨƲıۺͷ䷽ Ʋô֣ ծȨ˻
һ
ǹҺҶһ ծȨ˻γʵ˫ԭ ˵ծȨ˻һ飬 ͬʱ߱һDZгϯծȨ˻ĶծȨͨ ڶծȨծȨռƲծȨܶĶ ΪЧͬʱ߱ôͨľЧġ ˵ һծ˸ 120Ԫծ A B C D E F G7 ծȨ ģ A 5 B 10 C 15 D 30 E 40 F 10 G 10 . ڳծȨ֮ B вƲծȨˣ D ҲвƲծȨˣ ôͨծȨ˻ʱ ABCD BCDE ACG CEF CDFG ABCFG 6 ô ֱͨծȨ˻һ ǾͿɹծȨ˻ͨ涨ġҹƲ涨 ծȨ˻ͨһҪɳϯбȨծȨ˹ͨ ծȨռƲծȨܶİϣ ͨͽЭݰ ծȨծȨռƲծȨܶ 2 /3 .
һֱ ȿƲծȨжٸ 5 3 ٿƲծȨܶǶ٣ ȥ B 10 D 30 40 вƲծȨ 80 ΪƲծȨ İ40 ôͬʱ CEF ABCFG ͨͽЭݰҪծȨծȨռƲծȨܶ2 /3 ôֻCEF һҪ ҪͬʱϼӶ չ˴ծȨծȨ˵档
ծȨ˾ܾμծȨ˻鲻ӰծȨ˻ٿ ծȨ˻ľ鲻ðܾμծȨ˻ծȨ˶ƲƲܳĻᣬ Ҳܳľ顣
ծȨ˻Ч
ծȨ˻ľ飬ȫծȨ˾ԼȫծȨˣȰвƲģְƲģȰμӻģҲδμӻģȰͶƱģҲͶƱġֻҪijݺϷеծȨ˼Ч
ծȨ˻ծȨ˶ծȨ˻ľ飬ΪծȨ˻ľΥɡĹ涨ھ֮7 뷨Ժö7սû鼴Ч
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