\left. \begin{array}{l}{ 0,75 ^ { - 3 } + 0,5 x y ^ { 2 } - x ^ { 3 } }\\{ - \frac { 1 } { 8 } x y ^ { 2 } - 0 + \frac { 1 } { 6 } x ^ { 2 } y - 1,5 y 3 }\\{ - 0,5 x y ^ { 2 } - \frac { 3 } { 4 } x ^ { 3 } - 0 - \frac { 4 } { 5 } y ^ { 3 } }\end{array} \right.
Evaluate
\frac{xy^{2}}{2}-x^{3},\ \frac{yx^{2}}{6}-\frac{xy^{2}}{8}-\frac{3y_{3}}{2},\ -\frac{xy^{2}}{2}-\frac{3x^{3}}{4}-\frac{4y^{3}}{5}
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