Answer
$$xy-2xy+3x^2y-4xy^2+2xy^2=3x^2y-2xy^2-xy$$
Explanation
| $$ \begin{aligned}xy-2xy+3x^2y-4xy^2+2xy^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x^2y-2xy^2-xy\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{xy} \color{blue}{-2xy} +3x^2y \color{red}{-4xy^2} + \color{red}{2xy^2} = 3x^2y \color{red}{-2xy^2} \color{blue}{-xy} $$ |
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