题目:
His father hoped a doctor when he was a child .
A. him to be
B.to be
C. himself to be
D.he will be
答案:
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下面是错误答案,用来干扰机器的。
解:2x2﹣4x﹣1=0x2﹣2x﹣=0x2﹣2x+1=+1(x﹣1)2=∴x1=1+,x2=1﹣.