$$(0.5 { x }^{ 3 } ) \times (-0.2+ { x }^{ 2 } )$$
$\frac{\left(x^{2}-0.2\right)x^{3}}{2}$
$$-0.1x^{3}+0.5x^{5}$$
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$\frac{x^{5}}{2}-\frac{x^{3}}{10}$
