题目内容

在横线里填上合适的数或符号.
(1)
2
5
-
1
9
-
8
9
+
3
5
=
2
5
+
3
5
-(
1
9
______
8
9

(2)
11
18
-(
7
18
+
1
9
)=
11
18
-______-______
(3)
5
19
+
6
11
+
5
11
+
10
19
=(
5
19
+______)+(______+______)
(4)
2
7
+
5
11
+
5
7
=______+______+
5
11

(1)
2
5
-
1
9
-
8
9
+
3
5

=
2
5
+
3
5
-(
1
9
+
8
9
),
=1-1,
=0;

(2)
11
18
-(
7
18
+
1
9
).
=
11
18
-
7
18
-
1
9

=
2
9
-
1
9

=
1
9


(3)
5
19
+
6
11
+
5
11
+
10
19

=(
5
19
+
10
19
)+(
6
11
+
5
11
),

=
15
19
+1,
=1
15
19


(4)
2
7
+
5
11
+
5
7

=
2
7
+
5
7
+
5
11

=1+
5
11

=1
5
11


故答案为:+,
7
18
1
9
10
19
6
11
5
11
2
7
5
7
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