由x+y=3得 x=3-y代入2x+3y=k,3x+2y=k+11中得 2（3-y）+3y=k,即,y=k-6 3（3-y）+2y=k+11,即,y= -2-k, 则,k-6=-2-k,解得,k=2.,9,
