问题 解答题
口算.
46+34=
72-28=800×5=5000+200=
32×2=96÷3=80÷4=7700-700=
64÷2=27+45=85-78=1400-600=
2
5
+
1
5
=
4
7
-
1
7
=
3
8
+
4
8
=
9
10
-
6
10
=
答案

46+34=80,72-28=44,800×5=4000,5000+200=5200,
32×2=64,96÷3=32,80÷4=20,7700-700=7000,
64÷2=32,27+45=72,85-78=7,1400-600=800,
2
5
+
1
5
=
3
5
4
7
-
1
7
=
3
7
3
8
+
4
8
=
7
8
9
10
-
6
10
=
3
10

单项选择题
单项选择题