Excel in math, science, and engineering

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A magnifying glass is a convex lens. It makes a nearby object look bigger by converging light rays.

If you look at the same object with the magnifying glass while ...

Filling a \( 5 \times 5 \) grid with distinct integers from 1 to 25, what is the minimum of the maximum of the differences between 2 squares that share a common ...

How many pairs of positive integers \( x \leq y \) satisfy

\[ xy = x + y + \gcd(x,y) ? \]

How many solutions does the equation below have?

\[ \Huge| \huge| \Large| \large||x-8| -10|- 4\Large| \large-5 \huge| \large-1 \Huge| \large{=0} \]

A certain country has a domestic air traffic system with 5 airlines. The country regulates that

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