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1.ijIһһKIĿͶʣмסx֪׷ֵֵ1000Ԫʞ300Ԫҷֵֵ1200Ԫʞ330Ԫн_
A.׷ҷ
B.׷ķմҷ
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SB
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2.֪׷Ͷֵ15%ҷͶֵ12%ͶʷգȽϼסմСõָ 2003ݏ?BR>A.
B.ֵ
C.
D.
SD
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%

A

B

0.30

30

40

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0.50

15

15

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0.20

5

15

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1ABAֵ
S
AAֵ0.3×30%+0.5×15%+0.2×-5%=15.5%
BAֵ0.3×40%+0.5×15%+0.2×-15%=16.5%
2ABA\?BR>S
AA\
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=12.13%
BA\
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3ABA\ʣ
S
Aʣ12.13%÷15.5%78.26%
Bʣ19.11%÷16.5%115.8%