l - длина окружности = 2πr=2*3.14*10
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l - длина окружности = 2πr=2*3.14*10
Подставляем:![a*l-b=\dfrac{1}{20*3.14}*2*3.14*10-2 =1-2=-1 a*l-b=\dfrac{1}{20*3.14}*2*3.14*10-2 =1-2=-1](https://tex.z-dn.net/?f=a%2Al-b%3D%5Cdfrac%7B1%7D%7B20%2A3.14%7D%2A2%2A3.14%2A10-2%20%3D1-2%3D-1)