Ответы и объяснения

2013-10-14T10:58:09+00:00
99:9+9=20          99*9-9*9=810                                                                                                          999+9=1008                                                                                             (99-9):9=10                                                                                                                 (55-5)*(5*5-5)=1000                                                                                                     9:9+999=1000