长方体棱长x,y,z,x+y+z = 24,表面积= 2(xy+yz+xz) = 20
(x+y+z)^2 - 2(xy+yz+xz) = x^2+y^2 +z^2 = 24*24-20 = 556
对角线=根号(x^2+y^2+z^2)= 2根号(139)
长方体棱长x,y,z,x+y+z = 24,表面积= 2(xy+yz+xz) = 20
(x+y+z)^2 - 2(xy+yz+xz) = x^2+y^2 +z^2 = 24*24-20 = 556
对角线=根号(x^2+y^2+z^2)= 2根号(139)