Root 18 /5root18+3root72minus2 root 162
Simplify
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=√18 / 5√18 + 3√72 - 2√162
=1/5 + 3√72 - 2√162
=1/5 + 18√2 - 2×9√2
=1/5 + 18√2 - 18√2
=1/5
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