Высшие умы по физике , хелп ми

Question

Высшие умы по физике , хелп ми

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Answer 1

2R*R/(2R+R)=(2/3)R
(2/3)R+R=(5/3)R
(5/3)R/2=(5/6)R
(5/6)R*R/((5/6)R+R)=(5/11)R
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