1.

Expand \({\left( {\frac{x}{3} + \frac{y}{5}} \right)^3}\)

A. \(\frac{{{x^3}}}{{25}} + \frac{{{x^2}y}}{{15}} + \frac{{x{y^2}}}{{25}} + \frac{{{y^3}}}{{125}}\)
B. \(\frac{{{x^3}}}{{27}} + \frac{{{x^2}y}}{{25}} + \frac{{x{y^2}}}{{25}} + \frac{{{y^3}}}{{125}}\)
C. \(\frac{{{x^3}}}{{27}} + \frac{{{x^2}y}}{{15}} + \frac{{x{y^2}}}{{25}} + \frac{{{y^3}}}{{125}}\)
D. \(\frac{{{x^3}}}{{27}} + \frac{{xy}}{{15}} + \frac{{x{y^2}}}{{25}} + \frac{{{y^3}}}{{125}}\)
Answer» D. \(\frac{{{x^3}}}{{27}} + \frac{{xy}}{{15}} + \frac{{x{y^2}}}{{25}} + \frac{{{y^3}}}{{125}}\)


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