(x + 450) - 3 540 = 4 000 : 80 и (1 234+n) + 2140 = 52741​

ответ: внизу:)

Пошаговое объяснение:

1.(x+450)-3540=4000:80

(x+450)-3540=50

x+450=50+3540

x=3590-450

x=3140

2.(1234+n)+2140=52741

1234+n=52741-2140

1234+n=50601

n=50601-1234

n=49 367

Х+9=27        х-7=14         60-с=18        2х+1=77              4х-3=29
х=27-9         х=14+7        с=60-18        2х=77-1                4х=29+3  
х=18            х=21            с=42            2х=76                   4х=32 
18+9=27       21-7=14       60-42=18      х=76/2                  х=32/4   
                                                          х=38                     х=8        
                                                          2*38+1=77            4*8-3=29
                                 

Х+9=27        х-7=14         60-с=18        2х+1=77              4х-3=29
х=27-9         х=14+7        с=60-18        2х=77-1                4х=29+3  
х=18            х=21            с=42            2х=76                   4х=32 
18+9=27       21-7=14       60-42=18      х=76/2                  х=32/4   
                                                          х=38                     х=8        
                                                          2*38+1=77            4*8-3=29