1/R=(r1+r2)/r1r2
故R=r1r2/(r1+r2)
已知公式1/R=1/r1+1/r2(r1+r2≠0）则R=?
已知公式1/R=1/r1+1/r2(r1+r2≠0）则R=?
数学人气：943 ℃时间：2020-03-29 19:36:53
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