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bài 2 \begin{array}{l} x = 0 \Rightarrow \dfrac{3}{2} = a - b + \dfrac{c}{2} \Leftrightarrow 2a - 2b + c = 3\\ x = - 1 \Rightarrow \dfrac{3}{2} = \dfrac{a}{4} - \dfrac{b}{2} + c \Leftrightarrow a - 2b + 4c = 6\\ x = 2 \Rightarrow \dfrac{{21}}{4} = a + b + \dfrac{c}{4} \Leftrightarrow 4a + 4b +...