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daca x+y=7 si x-1=1 atunci√(lung)x²+y²=

Răspuns :

x-1=1
x=1+1
x=2

si
x+y=7
→ 2+y=7
y=7-2
y=5

√(x²+y²) = √(2²+5²)=√(4+25)=√29