(x+1)²+(y-1)²+|z|=0(x+1)²=0,(y-1)²=0,|z|=0x=-1y=1z=0A=2x³-xyz=2*(-1)³-(-1)*1*0=-2B=y³-z²+xyz=1³-0²+(-1)*1*0=1C= -x³+2y²-xyz= -(-1)³+2*1²-(-1)*1*0=1+2=3A-[2B-3(C-A)]=A-[2B-3C+3A]=A-2B+3C-3A=-2A-2B+3C=-2*(-2)-2*1+3*3=4-2+9=11