1 Tính: a $\frac{25^5.5^5}{65^10}$ b $\frac{15^3 +5.15^2-5^3}{18^3 +6.18^2-6^3}$ 2Tìm x: (x- $\frac{1}{3}$ ). (x+$\frac{2}{3}$ )$\geq$ 0
1 Tính: a $\frac{25^5.5^5}{65^10}$ b $\frac{15^3 +5.15^2-5^3}{18^3 +6.18^2-6^3}$ 2Tìm x: (x- $\frac{1}{3}$ ). (x+$\frac{2}{3}$ )$\geq$ 0