Question

当k取和值时,方程4k²-(k+2)x+(k-1)=0

Answer 1

方程是：4x²-(k+2)x+(k-1)=0吧?

1、将x=1代入方程得：4-(k+2)+(k-1)=0

解得：k无解

2、要使方程有两个相等的实数根

则△=(k+2)²-4*4(k-1)

=k²+4k+4-16k+16

=k²-12k+20

=(k-2)(k-10)

=0

解得：k=2或10