运用运算律计算:1/x+y+z*(1/x+1/y+1/z)×1/xy+yz+zx*1/xy+1/yz+1/zx

问题描述:

运用运算律计算:1/x+y+z*(1/x+1/y+1/z)×1/xy+yz+zx*1/xy+1/yz+1/zx

你的表达可能有点问题,是不是想求:[1/(x+y+z)](1/x+1/y+1/z)[1/(xy+yz+zx)][1/(xy)+1/(yz)+1/(zx)]?若是这样,则方法如下:∵1/x+1/y+1/z=(yz+zx+xy)/(xyz),∴(1/x+1/y+1/z)...