Mathematics for IGCSE & O level - Surds (Section 2 - No. 49)

Rationalize the denominator: 1/ (√5 + 2).

√5 - 2

2-√5

(√5 + 2) / 9

1/√5 - 2

解释

(1 / (√5+2)) * ((√5-2) / (√5-2)) = (√5-2) / (5-4) = √5 - 2

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