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    				| 1. | यदि x = 15 व y = 27 तब 81x2 – 90xy + 25y2 का मान ज्ञात कीजिए। | 
| Answer» 81x2 – 90xy + 25y2 = (9x)2 – 2 × 9x × 5y + (5y)2 = (9x – 5y)2 = (9 × 15 – 5 × 27)2 = (135 – 135) = 0 | |