²-4ac
=(4k+1)²-4k(3k+3)
=16k²+8k+1-12k²-12k
=4k²-4k+1
=(2k-1)²
∵k不是0
∴(2k-1)²>=0
∴方程有实数根
2.x1=[4k+1+2k-1]/(2k)=3
x2=(4k+1-2k+1)/(2k)=(2k+2)/(2k)=1+1/k
要得X2是整数,则1/k是整数,则有1/k=1或-1
即有K=1或-1
²-4ac
=(4k+1)²-4k(3k+3)
=16k²+8k+1-12k²-12k
=4k²-4k+1
=(2k-1)²
∵k不是0
∴(2k-1)²>=0
∴方程有实数根
2.x1=[4k+1+2k-1]/(2k)=3
x2=(4k+1-2k+1)/(2k)=(2k+2)/(2k)=1+1/k
要得X2是整数,则1/k是整数,则有1/k=1或-1
即有K=1或-1