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    				| 1. | यदि x – y = 6 व xy = 20, तब x3 – y3 के मान ज्ञात कीजिए। | 
| Answer» ∵ x2 + y2 + xy = (x – y)2 + 3xy = (6)2 + 3 × 20 = 36 + 60 = 96 ∵ x2 – y2 = (x – y)(x2 + y2 + xy) = (6)(96) = 576 | |