1.

यदि `x=z=225` और `y=226` है तो `x^(3)+y^(3)+z^(3)-3xyz` का मान ज्ञात करें।A. 765B. 676C. 674D. 576

Answer» Correct Answer - B
According to the question
`:, x=z=225`
`y=226`
`implies x^(3)+y^(3)+z^(3)-3xyz=?`
`x^(3)+y^(3)+z^(3)-3xyz=1/2(x+y+z)`
`[(x-y)^(2)+(y-z)^(2)+(z-x)^(2)]`
`=1/2[225+225+226][(225-226)^(2)+`
`(+226-225)^(2)+(225-225)^(2)]`
`=676/2xx[1+1+0]=676`


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