(a/b)^-1=______ (ab≠0)

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(a/b)^-1=______(ab≠0)(a/b)^-1=______(ab≠0)(a/b)^-1=______(ab≠0)(a/b)^-1=___b/a___(ab≠0)

(a/b)^-1=______ (ab≠0)
(a/b)^-1=______ (ab≠0)

(a/b)^-1=______ (ab≠0)
(a/b)^-1=___b/a___ (ab≠0)