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3√28 = 3√(2^2) * 7 = 3*2√7 = 6√7
√ 343 = √(7^2) * 7 = 7√7
√ 27 = √(3^2) * 3 = 3√3
SUMANDO LOS TÉRMINOS TENEMOS:
6√7 - 7√7 + 3√3 = (6-7)√7 + 3√3 = - √7 + 3√3
RESPUESTA
3√3 - √7