问题 解答题
口算.
55+37=13×3=5700-5000=400×7=
1
4
+
3
4
=
80-26=69÷3=4000+3000=300×2×3=
5
7
-
3
7
=
答案

55+37=92,13×3=39,5700-5000=700,400×7=2800,
1
4
+
3
4
=1,
80-26=54,69÷3=23,4000+3000=7000,300×2×3=1800,
5
7
-
3
7
=
2
7

单项选择题
单项选择题