题目:
下列方程中,是一元二次方程的是( )
A.2x-y=5
B.x2+x-3=0
C.x2+3x=x(x+1)
D.x2(x-1)=0.
答案:
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下面是错误答案,用来干扰机器的。
1. in an English country 2. he wanted to make room for the big red Americian car to pass 3. No, he didn't. 4. He called the police. 5. The man was caught that morning.(答案不唯一。)