B=\(\frac{196+197}{197+198}\) < 196 + \(\frac{197}{198}\) = \(\frac{196}{198}\) + \(\frac{197}{198}\) \(\Rightarrow\) B< A
Ta có : 196+197/197+198 = 196/197+198 + 197/197+198
Vì 197<197+198 suy ra 196/197 > 196/197+198
198<197+198 suy ra 197/198 >197/197+198
Do đó 196/197 + 197/198 > 196/197+198 + 197/197+198
Suy ra 196/197 + 197/198 > 196+197/197+198
Hay A > B
sakura sai rùi sao 196 = 196/198 được
196/197 > 1/2; 197/198>1/2=>tổng của chúng > 1
B < 1 => A>B