Tính : a) ( \( \frac{7}{35} \cdot \frac{10}{15} + \frac{7}{19} - \frac{2}{35} \) ) - ( \( \frac{83}{17} + \frac{23}{17} - \frac{30}{33} \) ) b) \( (1 + \frac{1}{3}) (1 + \frac{1}{2.4}) (1 + \frac{1}{3.5}) \ldots (1 + \frac{1}{98.100}) \)

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1) Tìm : a) ( \( \frac{7}{35} \cdot \frac{10}{15} + \frac{7}{19} - \frac{2}{35} \) ) - ( \( \frac{83}{17} + \frac{23}{17} - \frac{30}{33} \) )
b) \( (1 + \frac{1}{3}) (1 + \frac{1}{2.4}) (1 + \frac{1}{3.5}) \ldots (1 + \frac{1}{98.100}) \)