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题目内容 (请给出正确答案)
单选题
If a2-b2 = 12, and (a-b)= 4, then what is the& value of ab?
A

-7/4

B

-1/2

C

0

D

3/2

E

17/4


参考答案

参考解析
解析:
根据题干a2-b2 = (a + b)(a-b)= (a + b)(4)=12,所以(a + b)=3,又因为(a-b)= 4,两式相减2b=7,b=3.5,所以a=-0.5,所以ab=(3.5)(-0.5) =-1.75。
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