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    				| 1. | निम्न का मान ज्ञात कीजिए । `(x+y+2z)(x^(2)+y^(2)+4z^(2)-xy-2yz-2zx)` | 
| Answer» यहाँ `(x+y+2z)(x^(2)+y^(2)+4z^(2)-xy-2yz-2zx)` `= (x+y+2z)(x^(2)+y^(2)+(2z)^(2)-(x)(y)-(y)(2z)-(2z)(x)` `= (x)^(3) + (y)^(3) + (2z)^(3) - 3(x)(y)(2z) = x^(3) + y^(3) + 8z^(3) - 6xyz` | |