问题 解答题
直接写出得数.
21+17=

78-15=

200+3000=

4500-500=
24×2=40×3=35×2=20×6=
36÷3=48÷4=27÷9=80÷4=
1
9
+
4
9
=
7
8
-
2
8
=
3
7
+
1
7
=
1-
1
2
=
答案

21+17=38,

78-15=63,

200+3000=3200,

4500-500=4000,

24×2=48,40×3=120,35×2=70,20×6=120,
36÷3=12,48÷4=12,27÷9=3,80÷4=20,
1
9
+
4
9
=
5
9
7
8
-
2
8
=
5
8
3
7
+
1
7
=
4
7
1-
1
2
=
1
2

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