[tex]f(x) = 2 {x}^{2} - 5x + 2 \\ f'(x) = 2 \times 2 {x}^{2 - 1} - 5 {x}^{1 - 1} = 4 {x}^{} - 5 \\ 4x - 5 = 0 \\ 4x = 5 \\ x = 5 \div 4 \\ x = 1.25 \\ - - - [1.25] + + + [/tex]
Возрастает:
[tex]x \: \epsilon \: [1.25; \: + \infty)[/tex]
Убывает:
[tex]x \: \epsilon \: ( - \infty; \: 1.25][/tex]
Ответ: 1)
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[tex]f(x) = 2 {x}^{2} - 5x + 2 \\ f'(x) = 2 \times 2 {x}^{2 - 1} - 5 {x}^{1 - 1} = 4 {x}^{} - 5 \\ 4x - 5 = 0 \\ 4x = 5 \\ x = 5 \div 4 \\ x = 1.25 \\ - - - [1.25] + + + [/tex]
Возрастает:
[tex]x \: \epsilon \: [1.25; \: + \infty)[/tex]
Убывает:
[tex]x \: \epsilon \: ( - \infty; \: 1.25][/tex]
Ответ: 1)