Номер 525 1,2,3 5 классвот 3 пример 6 целых 5/9: 6целых4/19​

(х-83)+316=425                              (600-х)-92=126

х-83=425-316                                   600-х=126+92

х-82=109                                          600-х=218

х=109+82                                         х=600-218

х=191                                               х=382

253-(х-459)=138                               502-(217-х)=421

х-459=253-138                                  217-х=502-421

х-459=115                                          217-х=81

х=459+115                                         х=217-81

х=574                                                   х=136

871-(х+157)=385

х+157=871-385

х+157=486

х=486-157

х=329

а) (5486+3578)+1422=10486

б) 4523+(3788+1477)=9788

в) (357+768+589)+(332+211+643)=2900

г) (357+298+428)+(102+572+643)=2400

д) (259+728+293)+(541+607+272)=2700

Пошаговое объяснение:

а) (5486+3578)+1422=5486+(3578+1422)=5486+5000=10486

б) 4523+(3788+1477)=3788+(4523+1477)=3788+6000=9788

в) (357+768+589)+(332+211+643)=(357+643)+(768+332)+(589+211)=

=1000+1100+800=2900

г) (357+298+428)+(102+572+643)=(357+643)+(298+102)+(428+572)=

=1000+400+1000=2400

д) (259+728+293)+(541+607+272)=(259+541)+(728+272)+(293+607)=

=800+1000+900=2700