$$\frac{256 \times 256 - 144 \times 144}{112}$$ is equal to
$$\frac{256 \times 256 - 144 \times 144}{112} = \frac{256^2 - 144^2}{112} = \frac{(256 - 144)(256 + 144)}{112} = \frac{(112)(400)}{112} = 400$$
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