Calculation formula of circumference Radius, diameter, multiplication or division? Forget all about it. Don't use symbols. You can't understand it

C=D*3.14

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15. 1+2+3+4+5.+95+96+97+98+99＝?
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18. 1. The degree ratio of a base angle to a vertex angle of an isosceles triangle is 1:4, and its vertex angle is () 2. For a project, it takes 10 days for Party A to do it alone and 15 days for Party B to do it alone. The ratio of working time between Party A and Party B is (), and the ratio of working efficiency is ()
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