How can you roughly calculate this in your head?
Hello,
How can you roughly calculate -e^-1 in your head? Is there a trick or how would you do it?
(3 votes)
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I know that e^(-1) is about 37%, i.e. about 0.37. [I noticed this from electrical engineering… When a capacitor is discharged, the voltage has dropped to about 37% according to a τ.] Accordingly, -e^(-1) is approximately -0,37.
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Otherwise, I would also know that e ≅2.72 is ≅3 and could thus approximate…
…
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Otherwise, I would also know the series development of the exponential function…
This could be approximate…
… or something more accurate…
… or something more accurate…
… or something more accurate…
… or something more accurate…
… and so on. [While it would be quite difficult for me with further calculation after the step with -0,375 in the head.]
🙂 the trick is third? fourth class? Written parts. Only now in the head
but with 2.7 !
1 by 2.7
10 by 27 in the head should go
is 0
100 by 27 = 3
81, rest 19 , 190 by 27 = 7 ( 189 )
almost perfect 0.37 , but of course -0.37
so much memory every head has to hold
-e^(-1) = -1 / (e ^ 1) ≅ – 1 / 3 ≅ -0.33
The true value is about -0,37
I can only e^0 in my head
But ne in my head is hard. My trick would be memorable..