问题 解答题
260-0=72÷8=302×4=131×0=450-70=
102×4=700×4=93+40=398×5=21×5≈
102×4≈510×9≈
1
4
+
2
4
=
4
7
+
2
7
=
5
8
-
3
8
=
3
4
-
1
4
=
5
10
-
1
10
=
1-
5
6
=
1-
1
2
=
1
2
+
1
2
=
4
5
-
4
5
=.
答案

260-0=26072÷8=9302×4=128131×0=0450-70=380
102×4=408700×4=280093+40=133398×5=199021×5≈100
102×4≈400510×9≈4590
1
4
+
2
4
=
3
4
4
7
+
2
7
=
6
7
5
8
-
3
8
=
1
4
3
4
-
1
4
=
1
2
5
10
-
1
10
=
2
5
1-
5
6
=
1
6
1-
1
2
=
1
2
1
2
+
1
2
=1
4
5
-
4
5
=0.

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