ʲպָļ
յָҪʵķͱʵȡ
| ָ |
㹫ʽ |
||
| ֪δʷĸԼδʵĿֵʱ |
֪ʵʷʱ | ||
| ֵ ER |
ER= |
|
ӳԤƽֱա |
| 2 |
|
|
ֵͬ£ԽԽ |
| |
|
|
ֵͬ£ԽԽ |
| V |
|
|
ֵͬ£ԽԽ |
A.ҷ
B.ķմҷ
C.ķСҷ
D.ۼҷķմС
𰸣B
ΪֵͬӦʹñʣı=300/1000=0.3ҵı=330/1200=0.275ҷķսС
2.֪ͶʵֵΪ15%ҷͶʵֵΪ12%ͶʷգȽϼסմСӦõָǣ 2003꣩
A.
B.ֵ
C.
D.
𰸣D
ֵͬӦñʺա
3.ijҵͶʿ²ƷABɹѡԤ⣬ABԤʺ±ʾ
| г״ |
Ԥʣ% | ||
| A |
B | ||
| 0.30 |
30 |
40 | |
| һ |
0.50 |
15 |
15 |
| ˥ |
0.20 |
5 |
15 |
1ABԤʵֵ
𰸣
AԤʵֵ0.3×30%+0.5×15%+0.2×-5%=15.5%
BԤʵֵ0.3×40%+0.5×15%+0.2×-15%=16.5%
2ABԤʵı
𰸣
AԤʵı
=
=12.13%
BԤʵı
=
=19.11%
3ABԤʵıʣ
𰸣
Aʣ12.13%÷15.5%78.26%
Bʣ19.11%÷16.5%115.8%
