1,35 : 2,7 + 0,12 + 0,4 : 2,5 =

Let's break down the expression step by step:

1. Calculate \( 1.35 \div 2.7 \): \[ 1.35 \div 2.7 = 0.5 \]

2. Now add \( 0.12 \) to the result: \[ 0.5 + 0.12 = 0.62 \]

3. Next, calculate \( 0.4 \div 2.5 \): \[ 0.4 \div 2.5 = 0.16 \]

4. Finally, add this to the previous result: \[ 0.62 + 0.16 = 0.78 \]

So, the final result of the expression \( 1.35 : 2.7 + 0.12 + 0.4 : 2.5 \) is: \[ \boxed{0.78} \]