Пошаговое объяснение:
1) = 275 + 725 + 392 = 1000 + 392 = 1392
2) = 856 - 156 - 271 = 700 - 271 = 429
3) = 572 - 72 + 351 = 500 + 351 = 851
4) = 572 + 428 + 388 = 1000 + 388 = 1388
275+392+725=275+725+392=1000+392=1392
856-(271+156)=856-156-271=700-271=429
(572+351)-72=572-72+351=500+351=851
572+(388+428)=572+428+388=1000+388=1388
Пошаговое объяснение:
1) = 275 + 725 + 392 = 1000 + 392 = 1392
2) = 856 - 156 - 271 = 700 - 271 = 429
3) = 572 - 72 + 351 = 500 + 351 = 851
4) = 572 + 428 + 388 = 1000 + 388 = 1388
275+392+725=275+725+392=1000+392=1392
856-(271+156)=856-156-271=700-271=429
(572+351)-72=572-72+351=500+351=851
572+(388+428)=572+428+388=1000+388=1388