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Автор - lukianovg

помогите пожалуйста, не было на уроке(​

Ответ

Автор - drakerton

Ответ:

2) frac{3}{x} = frac{7}{18}\\x = frac{3*18}{7} = frac{54}{7} = 7frac{5}{7}

3) S = pi R^2 = 3,1*100  = 310cм²

4) S = V*t\\S_1 = 5V*0,1t = 0,5S. S уменьшится в два раза.

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