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问题 解答题
直接写得数．
486÷2=400×4=180÷9=140÷7÷2=304×2=505÷5=
155÷5=240÷6×8=
5
7
-
3
7
=		1-
7
9
=
2
5
+
2
5
=
3
7
+
3
7
+
1
7
=
答案

486÷2=243400×4=1600180÷9=20140÷7÷2=10304×2=608505÷5=101
155÷5=31240÷6×8=320
5
7
-
3
7
=
2
7
1-
7
9
=
2
9
2
5
+
2
5
=
4
5
3
7
+
3
7
+
1
7
=1

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C．discover  

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