2. 职称英语
  3. For all real numbers v, the operation v* is defined by the equation v* = v-(v/3)

For all real numbers v, the operation v* is defined by the equation v* = v-(v/3)

游客2025-02-24  33
问题 For all real numbers v, the operation v* is defined by the equation v* = v-(v/3). If (v*)*=8, then v=?
选项 A、15
B、18
C、21
D、24
E、27
答案 B
解析 对于所有实数（real number）v,运算（operation）v*被定义为方程v*=v-v/3,若(v*)*=8,那么v等于多少？
本题的正确答案是B。由题意可得：v*=v-v/3=2v/3→(v*)*=2/3×2/3×v=4v/9=8 → v=18
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