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daca:x+y=1000,x-y=868,aflax,y=?


Răspuns :

1000+868=1868
1868\2=934- primul numar
934-868=66-al doilea numar

x + y + x - y = 1000 + 868 = 1868
2 x = 1868 , x = 1868 / 2 = 934
y = 1000 - 934 = 66
x - y = 868 , 934 - 66 = 868
x + y = 1000
934 + 66 = 1000