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Mathematics for IGCSE & O level - Surds (Section 2 - No. 42)

Which of the following is equivalent to 5√2 + 2√8 - √18?
6√2
8√2
10√2
14√2

Wyjaśnienie

5√2 + 2√8 - √18 = 5√2 + 4√2 - 3√2 = 6√2

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