`(15^3+5.15^2-5^3)/(15^3+6.15^2-6^3)`
`=(5^3. (3^3)+5.(3^2).(5^2)-5^3)/(5^3.(3^3)+3.2.(5^2).(3^2)-(2^3).(3^3))`
`=(5^3.(3^3)+5^3.(3^2)-5^3)/(5^3.(3^3)+(3^3).(5^2)-3^3.(2^3))`
`=(5^3.(3^3+3^2-1))/(3^3.(5^3+5^2-2^3)`
`=(125.(27+9-1))/(27.(125+25-8))`
`=(125.35)/(27.142)`
`=4375/3834`
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