Respostas

2013-10-08T15:31:05-03:00
49,581+31+2,8=  83,381
  
  49,581
+31,000
  02,800
------------
  83,381


83,24-12,603=  70,637

 83,240
-12,603
------------
  70,637

6394,8x3,6=  
23021,28
  6394,8
  x     3,6
 ----------
  383688
191844+
-------------
23021,28


Espero ter te ajudado ((: