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