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1. $\frac{256 \times 256 - 144 \times 144}{112}$ is equal to = ?

A. 420

B. 400

C. 360

D. 320

Solution:

\begin{aligned} \frac{256 \times 256 - 144 \times 144}{112} \\ = \frac{{(256)}^{2} - {(144)}^{2}}{112} \\ = \frac{(112) (400)}{112} \\ = 400 \end{aligned}

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