问题 解答题
4
1
3
-2
1
6
+5
1
9
-3
7
18
+12
5
36
答案

4

1
3
-2
1
6
+5
1
9
-3
7
18
+12
5
36

=(4+

1
3
)-(2+
1
6
)+(5+
1
9
)-(3+
7
18
)+(12+
5
36
),

=4+

1
3
-2-
1
6
+5+
1
9
-3-
7
18
+12+
5
36

=(4-2+5-3+12)+(

1
3
-
1
6
+
1
9
-
7
18
+
5
36
),

=(4-2+5-3+12)+(

12
36
-
6
36
+
4
36
-
14
36
+
5
36
),

=16+

1
36

=16

1
36

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