Solving 3 non-linear equations using fsolve in MATLAB

I have the following 3 non-linear equations:

 (summation(i=1 to N)) (p(i)*k1(i)) <= Ith
 (summation(i=1 to N)) (p(i)*k2(i)) <= Ith
 (summation(i=1 to N)) p(i) <= pT

where

p(i)= [delf/{{lambda1*k1(i)}+{lambda2*k2(i)}+{lambda3}}] - [{2*sigma^2}/{h^2}]

Here N, Ith, pT, sigma, h, delf are constants. All values of k(i) from 1 to N are known. The values of lambda1, lambda2, lambda3 need to be found.How can I solve these equations using fsolve in MATLAB?