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单选题
For what value of a is a Φ 4 = 24?
A
3
B
4
C
6
D
25/4
E
8
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参考解析
解析：
You are told that a Φ b = ab－a. If a Φ 4 = 24, then b = 4 and ab－a = 24. Hence, 4a－a = 3a = 24, so a = 8.
You are told that a Φ b = ab－a. If a Φ 4 = 24, then b = 4 and ab－a = 24. Hence, 4a－a = 3a = 24, so a = 8.
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