To calculate the subtraction \((8.5 - 1.8i) - (-1.3 + 2.7i)\), we first simplify the expression by distributing the negative sign to the terms in the second group:
\[ (8.5 - 1.8i) + (1.3 - 2.7i) \]
Now, we combine the real parts and the imaginary parts separately:
- Real parts: \(8.5 + 1.3 = 9.8\)
- Imaginary parts: \(-1.8i - 2.7i = -4.5i\)
Putting it all together, we have:
\[ 9.8 - 4.5i \]
Thus, the answer in the form \(a + bi\) is:
\[ \boxed{9.8 - 4.5i} \]
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