已知丨x-1丨+丨y+2丨+丨z+3丨＝0，x-1=0 x=1y+2=0 y=-2z+3=0 z=-3（x+1）×（y-2）（—z+3）=(1+1)×(-2-2）×（3+3）=-48
x=1y=-2z=-3(x+1)(y-2)(-z+3)=2*(-4)*6=-48
