本课配套习题挑战模式1/5

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单选题
难度系数:

1.已知的值与字母的取值无关,则的值为(    )
A: 1
B: 0
C: -1
D: -2
  • 提示1IOWQiOW5tuWQjOexu+mhueWQjuWHoeaYr+WQq+acieWtl+avjTxpbWcgd2lkdGg9OCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zNy8zQi9yQkFDRTFObDZfdXhjclA4QUFBQkVwdWNBLXc5MTcucG5nIj7nmoTns7vmlbDpg73nrYnkuo4w5Y2z5Y+v