1. Упростите выражение [tex] \sqrt{ \frac{25 a^{6} }{49 b^{2} } } , a>0, b>0[/tex]

2. Сумма корней уравнения 7x² + 21x = 0 равна?

3. Вычислите: [tex](3 \sqrt{11})^2- \sqrt{6400}. [/tex]
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