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nthangks12
2 năm trước
Nhờ mn giúp đỡ ạ 1. Tìm x để các biểu thức sau ∈ Z a, $\frac{5}{2x-1}$ b, $\frac{2x+9}{x+3}$ c, $\frac{x-3}{x-5}$ 2. Chứng tỏ A= $\frac{12n+1}{30n+2}$ là phân số tối giản 4 Tính S= 1+2+2^2_2^3+...+2^2020 / 1-2^2021
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