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r×r+648=7×100+2×10+3×3

Răspuns :

R*r+648=7*100+2*10+3*3
R*r+648=700+20+9
R*r+648=729
729-648=81
729:81=9
R=9
r=9
R*r+648=>729
9*9=81
81+648=729
729=729