一、口算。
$0.23×0.3=$
$2.2×0.7=$
$1.5×0.9=$
$0.21×0.4=$
$12.5×0.8=$
$0.6×1.4=$
$1.05×0.2=$
$2.8×0.4=$
$0.23×0.3=$
0.069
$0.9×0.5=$0.45
$4.4×0.2=$0.88
$2.2×0.7=$
1.54
$3.2×0.05=$0.16
$0.16×0.8=$0.128
$1.5×0.9=$
1.35
$4.2×0.4=$1.68
$4.3×0.5=$2.15
$0.21×0.4=$
0.084
$3.6×0.8=$2.88
$0.5×4.1=$2.05
$12.5×0.8=$
10
$3.1×0.5=$1.55
$2.3×0.4=$0.92
$0.6×1.4=$
0.84
$5.4×0.2=$1.08
$7.2×0.4=$2.88
$1.05×0.2=$
0.21
$0.2×4.5=$0.9
$3.8×0.2=$0.76
$2.8×0.4=$
1.12
$0.6×1.3=$0.78
$5.2×0.4=$2.08
答案
一、0.069 0.45 0.88
1.54 0.16 0.128
1.35 1.68 2.15
0.084 2.88 2.05
10 1.55 0.92
0.84 1.08 2.88
0.21 0.9 0.76
1.12 0.78 2.08
1.54 0.16 0.128
1.35 1.68 2.15
0.084 2.88 2.05
10 1.55 0.92
0.84 1.08 2.88
0.21 0.9 0.76
1.12 0.78 2.08
二、用竖式计算。
$4.36×1.7$ $3.08×4.2$ $0.64×3.5$
$0.15×0.43$ $0.027×1.1$ $3.49×0.12$
$4.36×1.7$ $3.08×4.2$ $0.64×3.5$
$0.15×0.43$ $0.027×1.1$ $3.49×0.12$
答案
二、7.412 12.936 2.24
0.0645 0.0297 0.4188
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