(i) x+2xy+3y
The given expression has 3 terms.
For the first term x, the numerical coefficient is 1
For the 2nd term 2xy, the numerical coefficient is 2.
For the 3rd term 3y, the numerical coefficient is 3.
(ii) 1.2a+0.8b
The given expression has 2 terms.
For the first term 1.2a, the numerical coefficient is 1.2
For the 2nd term 0.8b, the numerical coefficient is 0.8