422. Bài tập về ứng dụng của đạo hàm trong vật lý và kinh tế. 391. Nếu f'(x) > 0 trên một khoảng thì f(x) có tính chất gì?

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... derivative of a scalar function f ( x ) = f ( x 1 , x 2 , … , x n ) {\displaystyle f(\mathbf {x} )=f(x_{1},x_{2},\ldots ,x_{n})}. {\displaystyle f(\mathbf {x} ... 1(x), n(x), l₁(x), 0 ≤ x ≤ ao, such that for every (x, y), (x, я) € Dao, ... a summable function x(x) > 0, 0 < x

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