问题 解答题
口算.
37+73=20×50=123÷3=4×50=80-28=60×13=
6+0.4=6-0.4=3.5+2.8=
1
7
+
5
7
=
1-
3
5
=
5
9
-
5
9
=
答案

37+73=110,20×50=1000,123÷3=41,4×50=200,80-28=52,60×13=780,
6+0.4=6.4,6-0.4=5.6,3.5+2.8=6.3,
1
7
+
5
7
=
6
7
1-
3
5
=
2
5
5
9
-
5
9
=0.

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