就用通俗的方法给你解答吧3x+2y+z=39(1)2x+3y+z=34(2)x+2y+3z=26(3)(1)式-(2)式得:x-y=5(4)3*(2)-(3)式得:5x+7y=76(5)由(4)(5)两式得x=111/12,y=51/12,z=11/4