一、口算。
$1.6 - 1.05 = $
$0.18 + 0.17 = $
$1.5 + 0.05 = $
$0.71 + 0.25 = $
$10 - 3.8 = $
$2.45 + 0.3 = $
$0.88 - 0.8 = $
$5.8 + 0.84 = $
$7.12 + 0.08 = $
$0.35 + 0.8 = $
$4.9 - 0.15 = $
$5.4 - 0.52 = $
$1.04 + 2.68 = $
$10.3 + 2.5 = $
$0.49 + 0.72 = $
$52.8 + 0.4 = $
$25.4 - 3.2 = $
$0.65 - 0.6 = $
$6.84 + 0.15 = $
$2.95 - 1.8 = $
$2.5 + 0.53 = $
$1.87 - 0.97 = $
$3.4 + 7 = $
$2.85 + 1.2 = $
$1.6 - 1.05 = $
0.55
$0.18 + 0.17 = $
0.35
$1.5 + 0.05 = $
1.55
$0.71 + 0.25 = $
0.96
$10 - 3.8 = $
6.2
$2.45 + 0.3 = $
2.75
$0.88 - 0.8 = $
0.08
$5.8 + 0.84 = $
6.64
$7.12 + 0.08 = $
7.2
$0.35 + 0.8 = $
1.15
$4.9 - 0.15 = $
4.75
$5.4 - 0.52 = $
4.88
$1.04 + 2.68 = $
3.72
$10.3 + 2.5 = $
12.8
$0.49 + 0.72 = $
1.21
$52.8 + 0.4 = $
53.2
$25.4 - 3.2 = $
22.2
$0.65 - 0.6 = $
0.05
$6.84 + 0.15 = $
6.99
$2.95 - 1.8 = $
1.15
$2.5 + 0.53 = $
3.03
$1.87 - 0.97 = $
0.9
$3.4 + 7 = $
10.4
$2.85 + 1.2 = $
4.05
答案
一、0.55 0.35 1.55
0.96 6.2 2.75
0.08 6.64 7.2
1.15 4.75 4.88
3.72 12.8 1.21
53.2 22.2 0.05
6.99 1.15 3.03
0.9 10.4 4.05
0.96 6.2 2.75
0.08 6.64 7.2
1.15 4.75 4.88
3.72 12.8 1.21
53.2 22.2 0.05
6.99 1.15 3.03
0.9 10.4 4.05
二、计算下面图形的面积。

答案
二、$12×8-(4+8)×4÷2=$
72($cm^{2}$)
$4×4÷2+6×6÷2+(7+$
$4+6)×6÷2=77(dm^{2})$
72($cm^{2}$)
$4×4÷2+6×6÷2+(7+$
$4+6)×6÷2=77(dm^{2})$
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