问题 填空题
3
10
+
3
10
+
3
10
=______×______=______
7
20
+
7
20
+
7
20
+
7
20
=______×______=______.
答案

(1)

3
10
+
3
10
+
3
10
=
3
10
×3=
9
10

(2)

7
20
+
7
20
+
7
20
+
7
20
=
7
20
×4=
28
20
=
7
5

故答案为:

3
10
,3,
9
10
7
20
,4,
7
5

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