в) $$\frac{17}{18} \cdot 1\frac{1}{51} = \frac{17}{18} \cdot \frac{52}{51} = \frac{17 \cdot 52}{18 \cdot 51} = \frac{17 \cdot 2 \cdot 26}{18 \cdot 3 \cdot 17} = \frac{26}{27}$$
Ответ: $$\frac{26}{27}$$