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Afla numerele necunoscute:
9000-x+420=1000
2500-(y-410)=1990


Răspuns :

9000 -x + 420 = 1000 / -420
9000 - x = 580
x = 9000 -580
x = 8420

2500 - (y -410) = 1990 / + 410
2500 - y = 2300
y=2500 -2300
y= 200
900-x+420=1000
1320-x=1000
x=1320-1000
x=32O