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单选题
If a3b2c<0, which of the following must be less than zero?
A
a2c
B
ab
C
ac
D
bc
E
ac2
参考答案
参考解析
解析：
If a3b2c<0, then either a or c is negative, but both cannot be negative. A negative times a positive is negative. So ac<0.
If a3b2c<0, then either a or c is negative, but both cannot be negative. A negative times a positive is negative. So ac<0.
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