题目:
当a=-1时,n为整数,则-an+1(a2n+3-a2n+1-3an+1+6an)的值是( ) |
A.9 B.3 C.-3 D.-9 |
答案:
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参考范文Water is important to all living things. It’s necessary for all plants. All animals can’t live without water. Humans need water to drink, to cook and to clean....