x+2y+3z=11.(1)x-3y+4z=5.(2)x+3y+2z=2.(3)(1)-(2),得5y-z=6.(4)(3)-(1),得y-z=-9.(5)(4)-(5),得4y=15y=3.75代入(5),得z=12.75代入(1),得x+2*3.75+3*12.75=11x=-34.75所以此方程的解为x=-34.75y=3.75z=12.75...