1. z^-7 × z^5/z^-2
= z^-7+5/z^-2
= z^-2/2^-2
= z^-2(-2)
= z^-2 + 2
= z^0
= 1 (A.)
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1. z^-7 × z^5/z^-2
= z^-7+5/z^-2
= z^-2/2^-2
= z^-2(-2)
= z^-2 + 2
= z^0
= 1 (A.)