Answer:
1,1,1
decomposition reaction
Step-by-step explanation:
The reaction equation is given as: 
 _Ca(OH)₂ → _CaO + _H₂O
This reaction is a decomposition reaction in which a single reactant breaks down to give two or more products. 
To balance the equation, we assign variables a, b and c, then we use a mathematical approach to solve the problem; 
 aCa(OH)₂ → bCaO + cH₂O
Conserving Ca : a = b 
 O: 2a = b + c 
 H: 2a = 2c 
let a = 1, b = 1 , c = 1