题目内容

脱式计算,能简算的要简算.
5
6
-(
2
3
-
1
9
1
2
+
4
5
-
3
10
32-
7
15
-
8
15
9
10
-
3
4
+
1
10
-
1
4
(1)
5
6
-(
2
3
-
1
9
),
=
5
6
-
5
9

=
5
18


(2)
1
2
+
4
5
-
3
10

=
13
10
-
3
10

=1;

(3)32-
7
15
-
8
15

=32-(
7
15
+
8
15
),
=32-1,
=31;

(4)
9
10
-
3
4
+
1
10
-
1
4

=(
9
10
+
1
10
)-(
3
4
+
1
4
),
=1-1,
=0.
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