Ответы и объяснения

2014-03-09T19:41:26+04:00
Х+45=90+7                     56+х=50+20                                х+26=60+4
х+45=97                          56+х=70                                       х+26=64
х=97-45                           х=70-56                                         х=64-26
х=52                                х=14                                                х=38
2014-03-09T21:44:18+04:00
Х+45=90+7                     56+х=50+20                                х+26=60+4
х+45=97                          56+х=70                                       х+26=64
х=97-45                           х=70-56                                         х=64-26
х=52                                х=14                                                х=38