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Mathematics for IGCSE & O level - Surds (Section 3 - No. 3)

Which expression simplifies to a rational number?
(2+√3) + (2-√3)
(2+√3) - (2-√3)
(2+√3) * (2-√3)
(2+√3) / (2-√3)

توضيح

(2+√3) * (2-√3) = 4 - 3 = 1

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