The answer is -1.

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$( -1)^{-1}, (-1)^1$ , and $1^{-1}$ are the three values in this question.

A: $(-1)^{-1}$ can be written as $\frac {1}{-1}$ which is equivalent to $-1$ .

B: $(-1)^1$ is the same as $-1$ because powers of one don't change anything.

C: $1^{-1}$ can be written as $\frac {1}{1}$ which is just the same as $1$ .

Adding these three values together gives $-1 + -1 + 1 = -1$