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निम्न द्विघात समीकरणों के मूल ,यदि उनक...

निम्न द्विघात समीकरणों के मूल ,यदि उनका अस्तित्व हो तो द्विघाती सूत्र का उपयोग करके ज्ञात कीजिए :
(i) `3x^(2)-5x+2=0`
`(ii) x^(2) +4x+5=0`
(iii) `2x^(2) -2sqrt(2)x+1=0`

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