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МЭИ университет
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Simplify the expression \(\left(2 - \frac{a - b}{a + b}\right) \left(3 - \frac{a + 2b}{a + b}\right)^{-1} (2a + b) - 3b.\) 1) \(a - 2b\); 2) \(a\); 3) \(a + 4b\); 4) \(a + b\). Solve the equation \(\left(x^2 - 5x\right) \cdot \sqrt{4 + 3x - x^2} = 0\) and indicate the sum of its solutions. 1) 7; 2) 5; 3) 8; 4) 3.
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