👤

Află nr necunoscut: 9000-x + 420 = 1000. 2500 - ( y - 410 ) = 1990

Răspuns :

9000-x = 580
x= 8420

y-410=510
y= 920
9000-x=1000-420  
9000-x= 580
x=9000-580
x=8420    
 
2500-(y-410)=1990
y-410=2500-1990
y-410=510
y=510+410
y=920