1. \((x + 1)^3 + (x - 1)^3\) 2. \((a^2 + b^2 - 5)^2 - 4(ab + 2)^2\) 3. \((xx + 4y^2 - (2x + 2y)^2)\) 4. \((x - 1)^2 - (x + 1)^2\) 5. \(8x^3 - \frac{1}{8}\) 6. \(\frac{1}{25}x^2 - 64y^2\) 7. \(x^3 + \frac{1}{27}\) 8. \(81x^2 - 64y^2\)

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----- Nội dung ảnh -----
1. \((x + 1)^3 + (x - 1)^3\)
2. \((a^2 + b^2 - 5)^2 - 4(ab + 2)^2\)
3. \((xx + 4y^2 - (2x + 2y)^2)\)
4. \((x - 1)^2 - (x + 1)^2\)
5. \(8x^3 - \frac{1}{8}\)
6. \(\frac{1}{25}x^2 - 64y^2\)
7. \(x^3 + \frac{1}{27}\)
8. \(81x^2 - 64y^2\)