a,b互为倒数,则ab=__________;a,b互为负倒数,则ab=__________.

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a,b互为倒数,则ab=__________;a,b互为负倒数,则ab=__________.

a,b互为倒数,则ab=__________;a,b互为负倒数,则ab=__________.
a,b互为倒数,则ab=__________;a,b互为负倒数,则ab=__________.

a,b互为倒数,则ab=__________;a,b互为负倒数,则ab=__________.
a,b互为倒数,则ab=1;a,b互为负倒数,则ab=-1.

1
-1

1,-1

1;-1

1
一1

都等于 1

1,-1

1 1

1,-1

1,—1