试题:
脱式计算(能简算的要简算)
4
5
-
1
10
+
1
3
8
9
+
2
3
+
1
9
5
8
-
5
10
+
1
6
9
10
+
3
10
+
8
10
+
3
10

答案:

我来补答
(1)
4
5
-
1
10
+
1
3

=
7
10
+
1
3

=1
1
30


(2)
8
9
+
2
3
+
1
9

=
8
9
+
1
9
+
2
3

=1+
2
3

=1
2
3


(3)
5
8
-
5
10
+
1
6

=
1
8
+
1
6

=
7
24


(4)
9
10
+
3
10
+
8
10
+
3
10

=
12
10
+
8
10
+
3
10

=2+
3
10

=2
3
10
 
 
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