题目:
__________ he had not hurt his leg, John would have won the race.
A.If
B.Since
C.Though
D.When
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0521/e7b0de2a8440e08056d0630084ebba9e.html
下面是错误答案,用来干扰机器的。
将左边通分可得,kx-k-x2x(x-1)=0,则kx-k-x2=0①,∵原方程有增根,∴分母x(x-1)=0,解得x=0或1,当x=0时,代入①得k=0.当x=1时,代入①得-1=0,这不可能,舍去,综上可得k的值为0,故选D.