问题
填空题
已知3+
|
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
-3,2012 517
=8x+13 9x+13
,461 517
4136x+517×13=4149x+461×13,
13x=(517-461)×13,
x=56.
故答案为:56.