x=2012,2x²y-(-yx²）-3X²y=?
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x=2012,2x²y-(-yx²）-3X²y=?x=2012,2x²y-(-yx²）-3X²y=?x=2012,2x²y-(-y
x=2012,2x²y-(-yx²）-3X²y=?
x=2012,2x²y-(-yx²）-3X²y=?
x=2012,2x²y-(-yx²）-3X²y=?
原式=2x²y+x²y-3x²y
=0
0
答案为0
过程：2x²y-(-yx²）-3X²y=2x²y+xy²-3x²y=0
等于0