f(x)= -4x³+x
f(-x)= -4(-x)³+(-x)=4x³-x= -(-4x³+x)=- f(x) нечетная
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f(x)= -4x³+x
f(-x)= -4(-x)³+(-x)=4x³-x= -(-4x³+x)=- f(x) нечетная