a,b,i0,v0,C = var('a','b','i0','v0','C')
show(solve([i0 == (1-1/(a*b))/((1/b)+C), v0 == a*i0/(1+a*i0)],a,b))
i0 = 0.46 v0 = 0.3 C = 1+0.1*(1+0.02)
sol = solve([i0 == (1-1/(a*b))/((1/b)+C), v0 == a*i0/(1+a*i0)],a,b)
sol
n(sol[0][0].rhs())
n(sol[0][1].rhs())