Proszę jak najszybciej wyznaczamy r2
R = (r1 * r2) / (r1 + r2)
R(r1 + r2) = r1 * r2
Rr1 + Rr2 = r1 * r2
Rr2 - r1 * r2 = - Rr1
r2(R - r1) = - Rr1
r2 = -Rr1 / (R - r1)
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R = (r1 * r2) / (r1 + r2)
R(r1 + r2) = r1 * r2
Rr1 + Rr2 = r1 * r2
Rr2 - r1 * r2 = - Rr1
r2(R - r1) = - Rr1
r2 = -Rr1 / (R - r1)