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Solution assignment 05 The basics

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Assignment 5

Calculate without the aid of a calculator:

\displaystyle\frac{639^2-312^2}{951}

Solution

This seems an impossible task, but it is not. Just apply one of the special products.

\displaystyle\frac{639^2-312^2}{951}=\displaystyle\frac{(639+312)(639-312)}{639+312}=639-312=327

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