ʲպָļ
KָҪķoH?/SPAN>
ָ |
㹫?SPAN lang=EN-US> |
||
֪δʷĸsδĿֵr |
֪ʷr | ||
ֵ ER |
ER= |
|
ӳAƽֱ |
2 |
|
|
ֵͬnԽԽ |
|
|
ֵͬnԽԽ | |
V |
|
|
ֵͬnԽԽ |
A.ҷ
B.ķմҷ
C.ķСҷ
D.JҷķմС
SB
ֵͬʹñʣ\=300/1000=0.3I\=330/1200=0.275ҷķС
2.֪Ͷֵ15%ҷͶֵ12%ͶʷգȽϼסմСõָ 2003ݏ?BR>A.
B.ֵ
C.
D.
SD
ֵͬñʺ
3.ijIͶʿ̔ƷABxA⣬ABAʺuʾ
C |
Aʣ% | ||
A |
B | ||
0.30 |
30 |
40 | |
һ |
0.50 |
15 |
15 |
˥ |
0.20 |
5 |
15 |
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\
=
=12.13%
BA\
=
=19.11%
3ABA\ʣ
S
Aʣ12.13%÷15.5%78.26%
Bʣ19.11%÷16.5%115.8%