假设：x = 3 + iy = 5i + j - 2k那么：x + y = 3 + 6i + j - 2kxy =( {3 + i} )( {5i + j - 2k} ) = 15i + 3j - 6k + 5i^2 + ij - 2ik= 15i + 3j - 6k - 5 + k + 2j = - 5 + 15i + 5j - 5k
