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afla x si y, daca x+y =1000si x-y=100

Răspuns :

x+y=1000
x-y=100⇒  x-100=y
adunam cele 2 relatii si rezulta (x+y)+(x-y)=1000+100⇒  x+y+x-y=1100⇒
2x=1100
x=550
y=x-100=550-100=450
y=450