Hello $\sum$

Test Math $$\sum_{i=1}^n x_i y_i $$

Tìm tất cả các hàm $ f,g,h: \mathbb{R} \to \mathbb{R} $ thỏa mãn $$(x-y)f(x) +h(x) -xy+y^2 \leq h(y) \leq (x-y)g(x) + h(x) -xy +y^2,\, \forall x,y \in \mathbb{R}$$

Tính tích phân $$\int\limits_0^{2\pi} \sin (2018x +\sin x){\rm d}x.$$

Test Math inline 1 $\sum_{i=1}^n x_i y_i $

Test Math inline 2 [latex]\sum_{i=1}^n x_i y_i [/latex]

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