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一、口算。
$3.9 + 0.39 = $
$0.19 - 0.13 = $
$3.4 + 4.6 = $
$7.2 - 2.7 = $
$3.52 + 2.4 = $
$3.6 + 5 = $
$5 - 0.28 = $
$4.8 - 0.04 = $
$3.9 + 0.39 = $
4.29
$9.3 - 3.9 = $5.4
$0.4 - 0.38 = $0.02
$0.19 - 0.13 = $
0.06
$0.67 + 1.24 = $1.91
$5.5 + 0.9 = $6.4
$3.4 + 4.6 = $
8
$6.6 - 4.4 = $2.2
$9.6 - 1.6 = $8
$7.2 - 2.7 = $
4.5
$2.08 - 1.8 = $0.28
$5.24 + 3.7 = $8.94
$3.52 + 2.4 = $
5.92
$6.4 + 6 = $12.4
$0.78 + 2.2 = $2.98
$3.6 + 5 = $
8.6
$20.5 + 2.05 = $22.55
$4.15 - 0.05 = $4.1
$5 - 0.28 = $
4.72
$5.7 + 14 = $19.7
$0.97 + 0.03 = $1
$4.8 - 0.04 = $
4.76
$4.08 - 0.52 = $3.56
$0.72 + 0.24 = $0.96
答案
一、4.29 5.4 0.02 0.06 1.91 6.4 8 2.2 8 4.5 0.28 8.94 5.92 12.4 2.98 8.6 22.55 4.1 4.72 19.7 1 4.76 3.56 0.96
二、计算下面各题。
$2.63 + 0.78 + 3.68$ $6.32 + 5.9 - 2.05$ $4.55 + 1.27 + 18.6$
$4.77 - 3.89 + 11.2$ $20.19 + 3.43 + 9.72$ $7.04 - 5.1 + 6.45$
$2.63 + 0.78 + 3.68$ $6.32 + 5.9 - 2.05$ $4.55 + 1.27 + 18.6$
$4.77 - 3.89 + 11.2$ $20.19 + 3.43 + 9.72$ $7.04 - 5.1 + 6.45$
答案
二、7.09 10.17 24.42 12.08 33.34 8.39
解析
2.63 + 0.78 + 3.68 = 3.41 + 3.68 = 7.09
6.32 + 5.9 - 2.05 = 12.22 - 2.05 = 10.17
4.55 + 1.27 + 18.6 = 5.82 + 18.6 = 24.42
4.77 - 3.89 + 11.2 = 0.88 + 11.2 = 12.08
20.19 + 3.43 + 9.72 = 23.62 + 9.72 = 33.34
7.04 - 5.1 + 6.45 = 1.94 + 6.45 = 8.39
6.32 + 5.9 - 2.05 = 12.22 - 2.05 = 10.17
4.55 + 1.27 + 18.6 = 5.82 + 18.6 = 24.42
4.77 - 3.89 + 11.2 = 0.88 + 11.2 = 12.08
20.19 + 3.43 + 9.72 = 23.62 + 9.72 = 33.34
7.04 - 5.1 + 6.45 = 1.94 + 6.45 = 8.39
