问题
填空题
关于x的方程（a-1）x2+（a2-1）x+2=0是一元二次方程的条件是______．
答案
∵是关于x的一元二次方程，∴a-1≠0，解得a≠1．
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关于x的方程（a-1）x2+（a2-1）x+2=0是一元二次方程的条件是______．
∵是关于x的一元二次方程，∴a-1≠0，解得a≠1．
A: 66 B: Hi, Billy A: 67 B: I have been to the shops, Look, I bought this hat. A: It’s pretty. 68 B: No, I didn’t. A: Where has she gone? B: 69 she will be back at about five o’clock. A: 70 she has been to the park every day this week. B: That’s because she plays tennis there.
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