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Here's a summary of the math problems from the image:

Variant 3

1. Simplify the fraction: \[ \frac{4x^2 - 12ab + 9b^2}{4x^2 - 9b^2} \]

2. Simplify the expression and find its numerical value: \[ 3x^2 - 6xy + 3y^2 + \frac{8}{2x + y}, \quad y = 5, \, 2x + y = 8 \]

3. Simplify the fraction: \[ \frac{6x^2 - 5x}{x^2 + 2x} \]