问题 解答题
1-(
1
3
-
1
6
)-(
1
6
-
1
12
)-(
1
12
-
1
24
)-(
1
24
-
1
48
)
答案

1-(

1
3
-
1
6
)-(
1
6
-
1
12
)-(
1
12
-
1
24
)-(
1
24
-
1
48
),

=1-

1
3
+
1
6
-
1
6
+
1
12
-
1
12
+
1
24
-
1
24
+
1
48

=

2
3
+
1
48

=

11
16

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