|
|
"john" <johnboy98105@xxxxxxxxx> wrote in message
news:1167557963.377775.165150@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
> Q2:
> x > 1
> y > 1
>
> What is greater? 1 / ( 1/x + 1/y) or 1/x + 1/y that is...
>
> a. b.
> 1 1 1
> ------------------- or ------- + ------
> 1 1 x y
> ------- + ------
> x y
>
>
>
> A2: Need more information to determine the relationship.
>
>
> I got this one wrong after plugging in x = 2, y = 3
>
> so i figured....
>
> a. xy b. y + x
> ---------- ----------
> x + y xy
>
> 6/5 > 5/6
>
> or if x= 2, y = 5
>
> then
> 10/7 > 7/10
>
>
> or if x = 5, y = 5
>
> then 25/10 > 10/25
>
> I can't get why you need more info to determine the relantionship..
> What's the trick here?
When x=2, y=2 then a) =4/4 and b) =4/4
So in this particular instance, a) = b)
x=1.5, y=1.5 then a) = 2.25/3 b) = 3/2.25
In this instance, b) > a)
Nick
|
|