试题:
脱式计算.
2-(
5
6
+
3
10
)
2
3
+
4
5
-(
3
5
-
1
15
)
5
6
-
7
9
+
3
4
1
3
+
1
4
-
1
5

答案:

我来补答

(1)2-(
5
6
+
3
10
)

=2-
17
15

=
13
15


(2)
2
3
+
4
5
-(
3
5
-
1
15
)

=
2
3
+
4
5
-
3
5
+
1
15

=(
2
3
-
1
15
)+(
4
5
-
3
5
)

=
3
5
+
1
5

=
4
5


(3)
5
6
-
7
9
+
3
4

=
1
18
+
3
4

=
29
36


(4)
1
3
+
1
4
-
1
5

=
7
12
-
1
5

=
23
60
 
 
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