题目内容

计算.(能简算的要简算)
3
4
+
5
6
-
2
3
1
2
-(
1
4
+
1
8
)
13
18
+
2
9
+
5
18
+
7
9
1-
7
19
-
12
19
2
5
+(
5
6
-
1
3
)
2
5
+(
3
5
-
1
3
)
(1)
3
4
+
5
6
-
2
3

=
9
12
+
10
12
-
8
12

=
11
12


(2)
1
2
-(
1
4
+
1
8
),
=
4
8
-
2
8
-
1
8

=
1
8


(3)
13
18
+
2
9
+
5
18
+
7
9

=(
13
18
+
5
18
)+(
7
9
+
2
9
),
=1+1,
=2;

(4)1-
7
19
-
12
19

=1-(
7
19
+
12
19
),
=1-1,
=0;

(5)
2
5
+(
5
6
-
1
3
),
=
2
5
+
1
2

=
9
10


(6)
2
5
+(
3
5
-
1
3
),
=
2
5
+
3
5
-
1
3

=1-
1
3

=
2
3
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