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r×r+648=7×10+2×10+3×3
urgenttttt!!!!


Răspuns :

r•r+648=7•10+2•10+3•3

r•r+648=70+20+9

r•r+648 =99

r•r=648-99

r•r=549

Sper ca te-am putut ajuta!
R×r+648=7×10+2×10+3×3
R×r+648=70+20+9
R×r+648=99
R×r=-549