x(1-2i)(1-3i)+y(1-i)(1-3i)=5(1-i)(1-2i)x(-5-5i)+y(-2-4i)=5(-1-3i)(-5x-2y+5)-(5x+4y-15)i=0-5x-2y+5=0 且 5x+4y-15=0x=-1, y=5/z/=√26
