$$\left. \begin{array} { l } { 1 } \\ { ( x + y ) ^ { 3 } - ( x ^ { 3 } + y ^ { 2 } ) ? } \end{array} \right.$$
$y\left(3x^{2}+3xy+y^{2}-y\right)$
$$\left(x+y\right)^{3}-x^{3}-y^{2}=y\left(3x^{2}+3xy+y^{2}-y\right)$$
$$y\left(3x^{2}+3xy+y^{2}-y\right)$$
$$3xy^{2}+y^{3}-y^{2}+3yx^{2}$$
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$1,\ \left(x+y\right)^{3}-x^{3}-y^{2}$
