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2(X²Y+XY²)-2(X²Y-1)-2XY²-2 X=2 Y=4
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2(X²Y+XY²)-2(X²Y-1)-2XY²-2
=2X²Y+2XY²-2X²Y+2-2XY²-2
=(2X²Y-2X²Y)+(2XY²-2XY²)+2-2
=0
已知条件X=2 Y=4没有用处
=2X²Y+2XY²-2X²Y+2-2XY²-2
=(2X²Y-2X²Y)+(2XY²-2XY²)+2-2
=0
已知条件X=2 Y=4没有用处
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