x^2-(3k+1)x+2k(k+1)=0
(x-2k)(x-k-1)=0
x1=2k,x2=k+1
或x1=k+1,x2=2k
(1)2k+3(k+1)=8
k=1
(2)k+1+6k=8
k=1
∴k的值1