(3x²-xy-2y²)-2(x²+xy-2y²)化简
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(3x²-xy-2y²)-2(x²+xy-2y²)化简
(3x²-xy-2y²)-2(x²+xy-2y²)化简
(3x²-xy-2y²)-2(x²+xy-2y²)化简