Bài 2. Cho các biểu thức 2 2 2x 2x A 1 x    và 2 1 2x x 1 B x 3x 2 x 2        a) Rút gọn biểu thức A, B; b) Tính giá trị của A khi x 2 3;   c) Tính C = A – B; d) Tìm x Z  để C Z

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