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TENEMOS LOS SIGUIENTE:
(X + Y + Z)² = X² + Y² + Z² + 2(XY + XZ + YZ)
REEMPLAZAMOS:
(X + Y + Z)² = 50 + 2(49)
(X + Y + Z)² = 50 + 98
(X + Y + Z)² = 148
X + Y + Z = √148
X + Y + Z = 12,17
ESO ES TODO.