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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
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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。
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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