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3õص 1˫н

ھи֮ϵijһ֧()()ȻھŵӦӶʹи() 2ִ

ѭȥγһӦʹԷӡ 4ľ

øһšҵͶʵӣҲӦ ӻӡ

õƬ47

õƬ48

žõĹ

һ žó

õƬ49

˰˰Ӷݼһ˰ơ

ʿĸݾʵʩ˰գʵʩ˰Ĺҽ١ ˰

46 46

47 47

48 48

˰ʲ˰䶯䶯һ˰ơ ת˰˾˰Ϣ˰ȡ ˰ ˰˰䶯һ˰ơ ˰ȡ ۽˰ 49 49

õƬ50

50

ѧԺ ۾ѧ

50

õƬ51

һ

žú۾þ

i?g?s?ty

c?1600?0.75yd

t?800(˰)

i?1000

g?2000

1

y?c?i?g

y?1600?0.75(y?800)?1000?2000

c?1600?0.75yd

?4000?0.75y

yd?y?800

y?4000

0.25?16000(Ԫ

i?1000