2XY^2×(-3XY)^2=

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2XY^2×(-3XY)^2=2XY^2×(-3XY)^2=2XY^2×(-3XY)^2=2XY^2×(-3XY)^2=2XY^2×9X^2Y^2=18X^3Y^4提Y^2,算X=0,负2/918x3

2XY^2×(-3XY)^2=
2XY^2×(-3XY)^2=

2XY^2×(-3XY)^2=
2XY^2×(-3XY)^2
=2XY^2×9X^2Y^2
=18X^3Y^4

提Y^2,算X=0,负2/9

18x3次方y4次方