Question

[Lê Thị Mai Trang]

a) Tính nhanh \(A=\frac{1003\cdot2005-1002}{1003+2005\cdot1002}\cdot\frac{5-\frac{5}{11}+\frac{5}{7}-\frac{5}{17}+\frac{5}{2004}}{\frac{13}{2004}-\frac{13}{17}+\frac{13}{7}-\frac{13}{11}+13}\)

b) So sánh \(2002^{303}\)và \(303^{202}\); \(31^{11}\)và \(17^{14}\)