This image appears to be a math exam paper written in Vietnamese. It consists of four problems. Here's a quick overview of the content:

Problem 1 (4 points):

1. Calculate the value of the expression: $A = \frac{63^2 - 47^2}{215^2 - 105^2}$
2. Calculate the value of the expression: $B = x^6 - 50x^5 + 50x^4 - 50x^3 + 50x^2 - 50x + 50$ at $x = 49$

Problem 2 (4 points):

1. Expand the expression: $x^3 - 2x^2 + x - xy^2$
2. Find $n$ such that $n^2 + 2n + 20$ is a perfect square.

Problem 3 (5 points):

1. Show that for three real numbers $a$, $b$, and $c$ such that $abc = 1$, the following holds: $\frac{a}{ab+1} + \frac{b}{bc+1} + \frac{c}{ca+1} = 1$
2. Show that $a + b + c$ is divisible by 6 when $a^3 + b^3 + c^3 = a + b + 2024c$.
3. Find all integer pairs $(x, y)$ that satisfy: $x^2 - xy - 2022x + 2023y - 2024 = 0$

Problem 4 (6 points):

1. In the square $ABCD$, the sides $AB$, $BC$, $CD$, and $DA$ are extended to points $M$, $N$, $P$, and $Q$ such that $AM = BN = CP = DQ$. Prove that $AM = BN = CP = DQ$.
2. Calculate the area of triangle $MNPQ$.
3. Prove the following geometric relations in triangle $ABC$ (with $AB < AC$):
   • $I$ is the incenter of triangle $ABC$.
   • A line passing through $I$ and perpendicular to $BC$ intersects $AB$ at points $E$ and $F$.

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