[計量] 幾題數學請教
1.if x and y are integers and xy+1 is even,
which of the following must be odd?
(A)(x^2)(y^2)
(b)y(x+1)
(c)x(x+y)
(d)(x+y)^2
(e)(x+1)(y+1)
答案給的是A
但我覺得是D
想確定一下答案有沒有問題
2. when n articles are sold for p dollars each,
the revenue obtained from the sales is $1 more
than it would be if the price per article were
$1 higher and one less article were sold.
which of the following gives n in terms of p?
(a)n=(p-1)/(p+1)
(b)n=p+2
(c)n=p+1
(d)n=p
(e)n=p-1
這題是我看不懂題目在問什麼
想請教一下板上的大家
謝謝
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