2.9−1.9=
24×40=
5.5+2.4=
0.72−0.32=
6.33+2.11=
8.39−6.27=
4.3+5.61=
14.3−5.2=
0.89+7.11=
30×23=
80÷16=
52÷13=
240÷12=
5.18+3.2=
10.7+5.2=
8.2+2.6=
24×40=
5.5+2.4=
0.72−0.32=
6.33+2.11=
8.39−6.27=
4.3+5.61=
14.3−5.2=
0.89+7.11=
30×23=
80÷16=
52÷13=
240÷12=
5.18+3.2=
10.7+5.2=
8.2+2.6=
答案
1. 1 960 7.9 0.4
8.44 2.12 9.91 9.1
8 690 5 4
20 8.38 15.9 10.8
8.44 2.12 9.91 9.1
8 690 5 4
20 8.38 15.9 10.8
14.59−7.28=

540×50=

309×48=

36×275=
1.39+6.7=
416×15=
13−2.9=
29×407=
350×92=
540×50=
309×48=
36×275=
1.39+6.7=
416×15=
13−2.9=
29×407=
350×92=
答案
2. 7.31 27000 14832
9900 8.09 6240
10.1 11803 32200
(竖式略)
9900 8.09 6240
10.1 11803 32200
(竖式略)
平移法 计算下面图形中涂色部分的面积。

答案
3. 10×(10÷2)=50(cm²)
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