计算，能用简便算法的用简便算法．
2.5
×6.7×0.4＝[
]|
A ．4.5 |
B ．3.8 |
|
C ．6.7 |
D ．5.45 |
4.8
×11－4.8＝[
]|
A ．15 |
B ．48 |
|
C ．0.3636 |
D ．24 |
0.36
×1.01＝[
]|
A ．15 |
B ．48 |
|
C ．0.3636 |
D ．24 |
0.5
×0.25×16＝[
]|
A ．1.4 |
B ．0.732 |
|
C ．2 |
D ．0.6 |
0.125
×4.8＝[
]|
A ．1.4 |
B ．0.732 |
|
C ．2 |
D ．0.6 |
3.05
×0.24＝[
]|
A ．1.4 |
B ．0.732 |
|
C ．2 |
D ．0.6 |
4.5
×9＋4.5＝[
]|
A ．1 |
B ．0.19 |
|
C ．45 |
D ．242.4 |
2.4
×101＝[
]|
A ．1 |
B ．0.19 |
|
C ．45 |
D ．242.4 |
用简便方法计算
0.25
×1.9×0.4＝[
]|
A ．1 |
B ．0.19 |
|
C ．45 |
D ．242.4 |
工程队修一段公路，已经修好了
8.5千米，剩下的路是已修的1.6倍，这段公路全长[
]|
A ．12.2千米 |
B ．21.2千米 |
|
C ．2.21千米 |
D ．22.1千米 |