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Mathematics
Mathematics
Problem
If
n
>
0
n > 0
n
>
0
is an odd integer and
x
=
(
2
+
1
)
n
,
f
=
x
−
[
x
]
x = (\sqrt{2} + 1)^n, f = x - [x]
x
=
(
2
+
1
)
n
,
f
=
x
−
[
x
]
, then
f
1
−
f
2
\frac{f}{1-f^2}
1
−
f
2
f
is a. an irrational number b. a non-integer rational number c. an odd number d. an even number
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