1.

यदि `x=19` और `y=18` है तो `(x^(2)+y^(2)+xy)/(x^(3)-y^(3))` का मान ज्ञात करें?A. 1B. 37C. 324D. 361

Answer» Correct Answer - A
`x=19 y=18`
`(x^(2)+y^(2)+xy)/(x^(3)-y^(3))`
`=(x^(2)+y^(2)+xy)/((x-y)(x^(2)+y^(2)+xy))`
`=1/(x-y)=1/(19-18)=1`


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