zsϯ˻?nbsp;Ҳίϯ˻鲢Ȩʹ?nbsp;
˻ϯ1 ɷԺָ Ժбָ˻ϯ Ҫr Ժָ˻ϯ ˻ϯίT?nbsp;
Щ՟бأ {Ʋޱ Ʋ˻ϲб ַ һƲˣ r] Ԝ{Ʋ˷H Ʋ f\C˱C ȡôλ rҲƲ . Ʋô ˷ һ{Ʋˣ һƲˡ
˻ϯֻǸߡ
һ˻T?nbsp;Ʋ3 ޣ 15 ٿ Ժټ . һƲ5 1 ?nbsp; 5 1 һTծȨѾʼ?nbsp;ôTLr3 N8 1 ~15 KԂٿһ˻?nbsp;Ժԑһ˻ʸ ָ˻ϯ ˻й?nbsp;ͨ˾I
Ժ˻C֮һrٿ
һ ԺҪr
Ԝ ˻ϯҪr
Ҫr
ģ ռƲܶ1 /4 ϵҪrҲٿ
еһֶٿ˻?nbsp;Dzԑġ ǰȽr?nbsp;ξfһnf fܶ 100Ԫ A B C D E5 ˣ еֱ A 20 B 35 C 25 D 10 E 10 . BCrf ôٿ˻rֻҪռƲܶ 1 /4 ϣ 65 Ԫ 1/ 4Ҳ16 . 25 Ԫ˻Ϳٿֻ
fIJƲ֧ƲöǰƲ?nbsp;һ峥ΪΪɶȡծȨ˻顣˻?nbsp;
һ йCϣ _Ʋ?nbsp;lԸs{Ʋྉõٷ֮ٵ?nbsp;qDzǷ?nbsp;涨IJ?nbsp;˻ʹ
Ԝ ͨͽfW Ҫ˻ͽ?nbsp;˱ͽfW ծȨ˻?nbsp;ͨʲôôͨʲô TȨˉ| ˻ݠCPǷͨԴɺͽ?nbsp;
㱨档
ģͨƲ\ۺ^?nbsp;Ʋô ˻
һ
Һ~һ ˻pԭ f˻һ?nbsp;ͬrsһCϯ˻ͨ ԜռƲܶ ЧͬrsôͨľЧġ f һq 120Ԫ A B C D E F G7 ģ A 5 B 10 C 15 D 30 E 40 F 10 G 10 . C֮ B {Ʋˣ D Ҳ{Ʋˣ ôͨ˻r ABCD BCDE ACG CEF CDFG ABCFG 6 ô ֱͨ˻һ NͿ˻ͨ涨ġM涨 ˻ͨһҪɳϯб˹ͨ ռƲܶİϣ ͨͽfW ռƲܶ 2 /3 .
һֱ ȿƲжٸ 5 3 ٿƲܶǶ٣ ȥ B 10 D 30 40 {Ʋ 80 Ʋ İ40 ôͬr CEF ABCFG ͨͽfWҪռƲܶ2 /3 ôֻCEF һҪ Ҫͬrϼ չ˴f?nbsp;
˾ܾμ˻鲓]TȨ˚?nbsp;˻ľ鲻ÔaȨ˻ծȨؔr ҲHľ?nbsp;
˻Ч
˻ľ飬ȫծȨxȫծȨˣȰؔģְؔģȰμӻģ҅μӻģȰͶQģҲ僱ġֻҪXϷеծȨˊA?nbsp;
˻T˻ľ飬ΪծȨ˻ľΥɡҎa֮7 뷨Ժ?][?BR>
Ƽ