A=(3X²-4X²Y+5Y²)-(2X²Y-5XY²+6Y³)
=3X²-4X²Y+5Y²-2X²Y+5XY²-6Y³
=3X²-6X²Y+5Y²+5XY²-6Y³
A与2x²y-5xy²+6y³的和为3x²-4x²y+5y²
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