已知M=x+3y-3z,N=-2x+5y-z,且3M+2N+P=0,求多项式P

问题描述:

已知M=x+3y-3z,N=-2x+5y-z,且3M+2N+P=0,求多项式P

P=-3M-2N
=-3x-9y+9z+4x-10y+2z
=x-19y+11z