A与2x²y-5xy²+6y³的和为3x²-4x²y+5y²,求A

问题描述:

A与2x²y-5xy²+6y³的和为3x²-4x²y+5y²,求A

A=(3X²-4X²Y+5Y²)-(2X²Y-5XY²+6Y³)=3X²-4X²Y+5Y²-2X²Y+5XY²-6Y³=3X²-6X²Y+5Y²+5XY²-6Y³