Ответы и объяснения

  • pyffik
  • главный мозг
2013-02-01T16:42:06+00:00

( 327х - 5 295 ) : 57 = 389

327х - 5 295 =389 * 57

327х - 5 295 =22 173

327х =22 173 +5 295

327х =27 468

х =27 468 : 327

х =84

проверка:

( 327 *84 - 5 295) : 57 = 389

 

( 27х +11) *315 =11 970

27х +11= 11 970 : 315

27х +11 =38

27х=38 - 11 

27х =27

х =27 :27 

х=1

проверка: 

( 27 * 1 +11) *315= 11 970

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2013-02-01T16:48:04+00:00

389*57=22173                                                                                              (27х+11)*315=11970

22173+5295=27468                                                                                       27х+11=11970/315=38

327х=27468                                                                                                       27х=38-11=27

х=27468/327                                                                                                        х=1

х=84