问题 填空题
已知3+
1
1+
1
8+
13
x
=
2012
517
,则x=______.
答案

3+

1
1+
1
8+
13
x

=3+

1
1+
1
8x+13
x

=3+

1
1+
x
8x+13

=3+

1
9x+13
8x+13

=3+

8x+13
9x+13

所以,3+

8x+13
9x+13
=
2012
517

8x+13
9x+13
=
2012
517
-3,

8x+13
9x+13
=
461
517

4136x+517×13=4149x+461×13,

         13x=(517-461)×13,

           x=56.

故答案为:56.

单项选择题
单项选择题