用简便方法笔算.
3500
×16=[
]|
A .34560 |
B .24840 |
|
C .56000 |
D .1030000 |
用简便方法笔算.
1080
×23=[
]|
A .34560 |
B .24840 |
|
C .56000 |
D .1030000 |
用简便方法笔算.
490
×80=[
]|
A .8200 |
B .6530 |
|
C .39200 |
D .1680 |
用简便方法笔算.
205
×40=[
]|
A .8200 |
B .6530 |
|
C .39200 |
D .1680 |
用简便方法笔算.
56
×30=[
]|
A .8200 |
B .6530 |
|
C .39200 |
D .1680 |
先估算积是几位数,再笔算.
510
×37=[
]|
A .5766 |
B .12832 |
|
C .18870 |
D .16692 |
先估算积是几位数,再笔算.
186
×31=[
]|
A .5766 |
B .12832 |
|
C .18870 |
D .16692 |
先估算积是几位数,再笔算.
214
×78=[
]|
A .5766 |
B .12832 |
|
C .18870 |
D .16692 |
先估算积是几位数,再笔算.
401
×32=[
]|
A .5766 |
B .12832 |
|
C .18870 |
D .16692 |
计算,并且验算.
504
×20=[
]|
A .12320 |
B .10080 |
|
C .8100 |
D .15200 |