2x+5y=8.① 3x+2y=5.② ①X3-②X2得: 6x+15y-6x-4y=24-10 11y=14 y=14/11 .带入②,得: 3x+2×14/11 =5 3x=55/11-28/11 3x=27/11 x=9/11