5xy²-[3xy²-(4xy²-2x²y)]+2x²y-xy²
=5xy²-（3xy²-4xy²+2x²y）+2x²y-xy²
=5xy²-(-xy²+2x²y)+2x²y-xy²
=5xy²+xy²-2x²y+2x²y-xy²
=(5xy²+xy²-xy²)+(-2x²y+2x²y)
=5xy²
5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2
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