rationalise the denominator 1/5-2 root 2
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1/5-2√2
=1/5-2√2×5+2√2/5+2√2
=5+2√2/(5)² - (2√2)²
=5+2√2/25 - 4×2
=5+2√2/25-8
=5+2√2/17
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