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Question 123
$$\frac{0.72 \times 0.72 \times 0.72 - 0.39 \times 0.39 \times 0.39}{0.72 \times 0.72 + 0.72 \times 0.39 + 0.39 \times 0.39}$$ is equal to:
Solution
Given fraction is in the form of $$\dfrac{a^3-b^3}{a^2+ab+b^2}$$ which is $$a-b$$
Here, $$a = 0.72$$ and $$b = 0.39$$
Therefore, $$a-b = 0.72-0.39=0.33$$
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