问题 解答题
脱式计算,能简算的要简算.
1
2
-(
3
4
-
3
8
)

2
3
+(
1
2
-
1
6
)

3
14
+
5
13
+
8
13

4
9
+
1
7
+
5
9
+
6
7

4
7
8
-
7
11
+
1
8
-
4
11

3
5
-
11
20
+
3
4
答案

(1)

1
2
-(
3
4
-
3
8
),

=

1
2
-
3
8

=

1
8

(2)

2
3
+(
1
2
-
1
6
),

=

2
3
+
1
3

=1;

(3)

3
14
+
5
13
+
8
13

=

3
14
+(
5
13
+
8
13
),

=

3
14
+1,

=1

3
14

(4)

4
9
+
1
7
+
5
9
+
6
7

=(

4
9
+
5
9
)+(
1
7
+
6
7
),

=1+1,

=2;

(5)4

7
8
-
7
11
+
1
8
-
4
11

=(4

7
8
+
1
8
)-(
7
11
+
4
11
),

=5-1,

=4;

(6)

3
5
-
11
20
+
3
4

=

1
20
+
3
4

=

4
5

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