【去括号(4x-3y)-[-(3-x)+(x-y)]-5x还是去括号4xy²-3x²y-{3x²+xy²-[2xy²-4x²y+(x²y-2xy²)]}】

　　去括号(4x-3y)-[-(3-x)+(x-y)]-5x还是去括号4xy²-3x²y-{3x²+xy²-[2xy²-4x²y+(x²y-2xy²)]}