the infint  summation  maple cant evaluated it  when my variables  are more than one decimal number 

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how to approximate this number to The nearest decimal number by maple

0.6364562590

i used this  commend to plot three equation and it actually work .my question her how to show any point cordinates just i pointed on it ? could i do it by maple or what ?
help please 
implicitplot3d({f[1], f[2], f[3]}, Q[h] = 0 .. 100, S[h] = 0 .. 100, R[h] = 0 .. 100);

when i evaluate this summation if Q[h],S[h],R[h] are big floating numbers it take along time how i decrease this time 
P := simplify(sum(sum((t+1)*Q[h]^2*(1-Q[h])^(t+T)/(t+1+(R[h]/S[h])^sigma*(T+1)), t = 0 .. infinity), T = 0 .. infinity))

iam trying to apply newton method on non liner system but i have a problem for apply while loop inside other while loop 
any help please