780117:39+(5700:75+373-248)×8=21611
1)5700 75   2)+373  3)-449  4)*201  5)780117 39         6)  +20003
  -525   76          76       248          8      78       20003            1608
     450             449       201     1608        0                              21611    
     450                                                      0
       0                                                          1 
                                                                   0  
                                                                   11
                                                                    0
                                                                   117
                                                                   117
                                                                      0