解
∵1/(x-1)=2
∴x-1=1/2
2/(x-1)+x-1
=2×1/(x-1)+(x-1)
=2×2+1/2
=4+1/2
=9/2
1/(x+3)=2/(x+k)有负数解
两边同时乘以(x+3)(x+k)
∴x+k=2(x+3)
即x+k=2x+6
∴x=k-6
解
∵1/(x-1)=2
∴x-1=1/2
2/(x-1)+x-1
=2×1/(x-1)+(x-1)
=2×2+1/2
=4+1/2
=9/2
1/(x+3)=2/(x+k)有负数解
两边同时乘以(x+3)(x+k)
∴x+k=2(x+3)
即x+k=2x+6
∴x=k-6