Forwhich of the following functions f is ~$f\left ( x \right )=f\left ( 1-x \right )$~ for all x ?
~$f\left ( x \right )=1-x$~
~$f\left ( x \right )=1-x^{2}$~
~$f\left ( x \right )=x^{2}-\left ( 1-x \right )^{2}$~
~$f\left ( x \right )=x^{2}\left ( 1-x \right )^{2}$~
~$f\left ( x \right )=\frac{x}{1-x}$~
这道题真心没懂
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