题目内容

计算:(用你喜欢的方法计算)
2
3
+
1
4
8
9
-
5
6
5
6
+
1
2
+
2
3
8
9
+
4
5
-
8
9
1-
2
7
-
3
7
7
9
-
2
3
+
5
6

(1)
2
3
+
1
4

=
8
12
+
3
12

=
11
12


(2)
8
9
-
5
6

=
16
18
-
15
18

=
1
18


(3)
5
6
+
1
2
+
2
3

=
5
6
+
3
6
+
4
6

=2;

(4)
8
9
+
4
5
-
8
9

=
8
9
-
8
9
+
4
5

=
4
5


(5)1-
2
7
-
3
7

=1-(
2
7
+
3
7
),
=1-
5
7

=
2
7


(6)
7
9
-
2
3
+
5
6

=
1
9
+
5
6

=
17
18
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