问题 解答题
口算
56+37=80-16=31.5+5=12-1.1=
2×0.2=2.87÷0.7=30÷50=25×8=
4
15
÷
2
5
=
12×
2
3
=
3
8
×
4
5
=
1
4
+
1
5
=
4
5
=
7
8
=
1
6
+
5
6
=
7
15
-
1
15
=
答案

56+37=93,80-16=64,31.5+5=36.5,12-1.1=10.9,
2×0.2=0.4,2.87÷0.7=4.1,30÷50=0.6,25×8=200,
4
15
÷
2
5
=
2
3
12×
2
3
=8,
3
8
×
4
5
=
3
10
1
4
+
1
5
=
9
20
4
5
=
5
4
7
8
=0,
1
6
+
5
6
=1,
7
15
-
1
15
=
2
5

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