用友U8财务软件中QC("122102",全年,"借",,,"y",,)与QC("122102",全年...答:QC("122102",全年,"借",,,"y",,)表示期初122102全年借方包含未记账凭证的数,QC("122102",全年,,,"","",,,)是期初122102全年的数
PA,PB,PC两两垂直,PA=3,PB=4,PC=5,求点Q使QP+QA+QB+QC之和最小...答:QP+QA+QB+QC之和最小 即:(x-4)²+y²+z²=x²+(y-5)²+z²=x²+y²+(z-3)²=x²+y²+z²前三式减最后一式得:-8x+16=0,x=2 -10y+25=0,y=5/2 -6z+9=0,z=3/2 则Q点为:Q(2,5/2,3/2)