Given sum is based on the following formula
\( a^{3} - b^{3} = (a - b)(a^{2}+ab+b^{2}) \)
\( \large\frac{a^{3}-b^{3}}{a^{2}+ab+b^{2}} = a - b \)
= \( \large\frac{1.2 \times 1.2 \times 1.2 – 0.2 \times 0.2 \times 0.2}{1.2 \times 1.2 + 1.2 \times 0.2 + 0.2 \times 0.2} \)
a = 1.2; b = 0.2
a – b = 1.2 – 0.2
a – b = 1