r(ji) ~ cɱr(ji) ~
o(2011-5-12) һ(g)͑(h)ԃ(xn)Cψ--ԃ(xn) ijɱr(ji) c r(ji) Լ~ c ~ ôһքeô(li)

ɱr(ji)ԓ؛ƷĎr(ji)ϵyƄ(dng)әƽӋ(li)ģr(ji)=ǰ濂~/ǰ濂
Ƅ(dng)әƽ
ͨܛΰƄ(dng)әƽ(li)Ӌr(ji)ɱr(ji)
Ҫϵyijɱr(ji)ǸʲôʽӋ(li)ģ
ǰr(ji)ǰ濂~/ǰ濂
䌍(sh)Ҫ֪ϵyʲôrҪӋr(ji)
ÿһΌ˵ĕr(sh)ϵy͕(hu )Ԅ(dng)ӋһΎr(ji)Ҳÿһ؛Ʒľr(ji)͕(hu )׃һΣ
e
؛Ʒ A Fڂ}5(g)3Ԫ/(g)r(ji)15Ԫ
F2Ԫ/(g) ăr(ji)10(g) ô@Ό˵ĕr(sh)؛ƷAĎr(ji)͕(hu )l(f)׃
l(f)֮؛ƷAĎr(ji)͵ڣ
(15+20) ԣ5+10=2.33Ԫ
r(ji)@(g)r(ji)Ҳ A--؛Ʒnе 셢r(ji)@(g)r(ji)ǿ͑(h)ԼO

~~=r(ji)*ǰ攵
~~=r(ji)셢r(ji)*ǰ攵
eע⣺ô@(g)r(ji) ~
ЩÑ(h)üәƽr(ji)(li)؛Ʒăr(ji)ֵ
Ҏһ(g)r(ji)(li)
셢r(ji)Ñ(h)S׃셢r(ji)(li)oÑ(h)˂(g)µĺ㷽ʽ
磺
ʮǰSr(ji)^ʮǰSr(ji)ƽr(ji)ҲȻ
֪µĽr(ji)(li)õ@(g)