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spuneti mi va rog:169 la pătrat sa fie suma de 3 pătrate perfecte Dau coroana

Răspuns :

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

169²=28561

(144+16+9)²=144²+16²+9²+2×144×16+2×16×9+2×9×144

(144+16+9)²=20736+256+81+4608+288+2592=28561

169² = (144+16+9)²