题目内容

简便计算:
5
8
-(
1
8
+
3
10

12
11
-
2
9
-
7
9

1
8
-
3
7
+
7
8
-
4
7
(1)
5
8
-(
1
8
+
3
10
),
=
5
8
-
1
8
-
3
10

=
1
2
-
3
10

=
1
5


(2)
12
11
-
2
9
-
7
9

=
12
11
-(
2
9
+
7
9
),
=
12
11
-1,
=
1
11


(3)
1
8
-
3
7
+
7
8
-
4
7

=(
1
8
+
7
8
)-(
4
7
+
3
7
),
=1-1,
=0.
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