(√2/3)+(3√1/6)-(1/2√54),

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(√2/3)+(3√1/6)-(1/2√54),

(√2/3)+(3√1/6)-(1/2√54),
=(√6/3)+(3√6/6)-(3/2√6),
=(√6/3)+√6/2-(3/2√6),
=(√6/3)-√6
=-2√6/3