The reciprocal of -10 is
0.1
- 0.1
0.01
- 0.01
The reciprocal of any non-zero number 'a' is 1a. The reciprocal of '-10' = 1(−10)=−0.1
The reciprocal of 10 is ___ .
If a:b is the reciprocal ratio of 10:9, then a:b is ____