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一、口算。
$1.06 + 3.4 = $
$12.6 + 7.08 = $
$9.1 - 3.2 = $
$2.1 - 1.08 = $
$8.89 + 0.1 = $
$0.9 + 2.11 = $
$6.68 - 1.5 = $
$4.3 - 0.25 = $
$2.2 + 9.1 = $
$0.81 - 0.5 = $
$7.2 + 4.8 = $
$2.03 + 3.7 = $
$0.8 + 0.82 = $
$7.2 + 0.72 = $
$13.9 - 3.9 = $
$12.6 - 0.8 = $
$10 - 0.01 = $
$5.9 - 5 = $
$9.87 - 9.12 = $
$1.4 + 0.46 = $
$0.66 + 0.64 = $
$0.01 + 10.99 = $
$14.8 + 2.2 = $
$6.3 + 0.67 = $
$0.8 - 0.35 = $
$1.82 - 0.63 = $
$7.82 - 7.2 = $
$2.5 + 1.37 = $
$9.8 - 0.98 = $
$5.4 - 0.6 = $
$1.06 + 3.4 = $
4.46
$12.6 + 7.08 = $
19.68
$9.1 - 3.2 = $
5.9
$2.1 - 1.08 = $
1.02
$8.89 + 0.1 = $
8.99
$0.9 + 2.11 = $
3.01
$6.68 - 1.5 = $
5.18
$4.3 - 0.25 = $
4.05
$2.2 + 9.1 = $
11.3
$0.81 - 0.5 = $
0.31
$7.2 + 4.8 = $
12
$2.03 + 3.7 = $
5.73
$0.8 + 0.82 = $
1.62
$7.2 + 0.72 = $
7.92
$13.9 - 3.9 = $
10
$12.6 - 0.8 = $
11.8
$10 - 0.01 = $
9.99
$5.9 - 5 = $
0.9
$9.87 - 9.12 = $
0.75
$1.4 + 0.46 = $
1.86
$0.66 + 0.64 = $
1.3
$0.01 + 10.99 = $
11
$14.8 + 2.2 = $
17
$6.3 + 0.67 = $
6.97
$0.8 - 0.35 = $
0.45
$1.82 - 0.63 = $
1.19
$7.82 - 7.2 = $
0.62
$2.5 + 1.37 = $
3.87
$9.8 - 0.98 = $
8.82
$5.4 - 0.6 = $
4.8
答案
1.4.46 2.19.68 3.5.9 4.1.02 5.8.99 6.3.01 7.5.18 8.4.05 9.11.3 10.0.31 11.12 12.5.73 13.1.62 14.7.92 15.10 16.11.8 17.9.99 18.0.9 19.0.75 20.1.86 21.1.3 22.11 23.17 24.6.97 25.0.45 26.1.19 27.0.62 28.3.87 29.8.82 30.4.8
二、计算下面图形的面积。
答案
8×8÷2=32(m²) （3+3+2）×3÷2=12(m²)
