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一、口算。
$1.2×4= $
$1.2×8= $
$40×2.5= $
$12×0.4= $
$12×0.8= $
$4×2.5= $
$0.12×4= $
$12×0.08= $
$4×0.25= $
$0.08×8= $
$1.04×5= $
$0.45×6= $
$4×5.8= $
$0.35×4= $
$8.5×4= $
$0.6×60= $
$0.7×7= $
$10.5×3= $
$1.7×5= $
$0.26×20= $
$2×0.27= $
$0.81×6= $
$0.19×3= $
$1.52×2= $
$1.2×4= $
4.8
$1.2×8= $
9.6
$40×2.5= $
100
$12×0.4= $
4.8
$12×0.8= $
9.6
$4×2.5= $
10
$0.12×4= $
0.48
$12×0.08= $
0.96
$4×0.25= $
1
$0.08×8= $
0.64
$1.04×5= $
5.2
$0.45×6= $
2.7
$4×5.8= $
23.2
$0.35×4= $
1.4
$8.5×4= $
34
$0.6×60= $
36
$0.7×7= $
4.9
$10.5×3= $
31.5
$1.7×5= $
8.5
$0.26×20= $
5.2
$2×0.27= $
0.54
$0.81×6= $
4.86
$0.19×3= $
0.57
$1.52×2= $
3.04
答案
一、4.8 9.6 100 4.8 9.6 10 0.48 0.96 1 0.64 5.2 2.7 23.2 1.4 34 36 4.9 31.5 8.5 5.2 0.54 4.86 0.57 3.04
二、用竖式计算。
$5.6×25$
$0.47×18$
$210×0.027$
$4.6×120$
$2.34×15$
$0.068×23$
$5.6×25$
$0.47×18$
$210×0.027$
$4.6×120$
$2.34×15$
$0.068×23$
答案
二、140 8.46 5.67 552 35.1 1.564
