问题 解答题
直接写得数.
42×2=
41÷7=54÷9=
20×9+20=730-250=570+90=
3000×3=680-120÷4=1-
1
5
=
3
7
+
4
7
=
答案

42×2=84,41÷7=5…6,54÷9=6,
20×9+20=200,730-250=480,570+90=660,
3000×3=9000,680-120÷4=650,1-
1
5
=
4
5
3
7
+
4
7
=1.

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