问题 解答题
口算.
80÷4=5000+20=6400-400=8×500=5×12=96÷3=
90-55=44+38=61-56=130×3=
4
7
+
2
7
=
2
5
-
1
5
=
答案

80÷4=20,5000+20=5020,6400-400=6000,8×500=4000,5×12=60,96÷3=32,
90-55=35,44+38=82,61-56=5,130×3=390,
4
7
+
2
7
=
6
7
2
5
-
1
5
=
1
5

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