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1. Tìm x,y thỏa mãn: [TEX]y^2 + 2y + 4^x - 2^x^+^1 +2 = 0[/TEX]
2. Cho [TEX] a= x^2 + x + 1[/TEX]. Tính [TEX] A= x^4 + 2x^3 + 5x^2 + 4x + 4[/TEX].
2. Cho [TEX] a= x^2 + x + 1[/TEX]. Tính [TEX] A= x^4 + 2x^3 + 5x^2 + 4x + 4[/TEX].