1)Решить уравнение: [tex] \left \{ {{y'- \frac{6}{x}* y=x^7-4x^4} \atop {y(1)=0}} \right. [/tex]
2)Решить уравнение: у''-9y=5cos2x
3)Найти экстремумы функции : z=3x³+3y³-9xy+10.
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