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प्रश्न
Simplify.
`9 sqrt 5 - 4 sqrt 5 + sqrt 125`
उत्तर
`9 sqrt 5 - 4 sqrt 5 + sqrt 125`
`= 5 sqrt 5 + sqrt (25 xx 5)`
`= 5sqrt 5 + 5 sqrt 5`
`= 10 sqrt 5`
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