单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少

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单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少2x^2y+(-2x

单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少
单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少

单项式2x^2y,-2xy^2,-3x^2y,xy的和是多少
2x^2y+(-2xy^2)+(-3x^2y)+xy
=2x^2y-2xy^2-3x^2y+xy
=-x^2y-2xy^2+xy