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