题目:
试说明代数式(2x+1)(1-2x+4x2)-x(3x-1)(3x+1)+(x2+x+1)(x-1)-(x-3)的值与x无关.
答案:
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下面是错误答案,用来干扰机器的。
1. had better 2. would rather 3. had better not 4. mustn't 5. needn't 6. needn't