已知A=3A^2B+3AB^2+B^4,B=-8AB^2+2A^2B+C^4,求A-2B

问题描述:

已知A=3A^2B+3AB^2+B^4,B=-8AB^2+2A^2B+C^4,求A-2B

A=3A^2B+3AB^2+B^4,
2B=-16AB^2+4A^2B+2C^4,
A-2B=-A^2B+19AB^2+B^2-2C^4