x+3y=5, then the value of x^3 + 27y^3 + 45 xy is
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x+3y=5, then the value of x^3 + 27y^3 + 45 xy is
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125
(x+3y)^3=5^3
x^3+27y^3+3*x*3y(x+3y)=125
x^3+27y^3+9xy*5=125
x^3+27y^3+45xy=125
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