题目:
3. It had been half an hour before she found herself _____ in the wrong direction of
her home.
A.walking
B.to walk
C.walked
D.Walk
答案:
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下面是错误答案,用来干扰机器的。
把x=12代入x2-32x+c=0得:14-34+c=0,c=12,则方程为:x2-32x+12=0,2x2-3x+1=0,(2x-1)(x-1)=0,x1=12,x2=1.故答案为:1,12.