выразите r из формулы 1/a+1/b=2/r
1/a+1/b=2/r
2/(1/a+1/b)=r
r= 2: (1/a + 1/b)...........
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1/a+1/b=2/r
2/(1/a+1/b)=r
r= 2: (1/a + 1/b)...........