解答:
1)xy^2-1/5*xy^2=4/5*xy^2
2)-3x^2*y-4xy^2+2x^2*y-2xy^2=-x^2*y-6xy^2
3)4x^2-8x+5-3x^2+6x-2=x^2-2x+3
4)3x^2*y-4xy^2-3+5x^2*y+2xy^2+5
=8x^2*y-2xy^2+2
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