sumaia.saad-eddin on Thu, 08 Dec 2011 14:51:56 +0100

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 Compute the value of the function

Good morning


I have the function f(x,a,b), I would like to compute the value of this function under the condition ((x-1)*b \leq a \leq 2*x*b),
I write

if(a>2*x*b, print("a<=2*x*b is not required, [a,b,x] = ",[a,b,x]),);


My problem is that I do not know how can I add the second condition ((x-1)*b \leq a )

Thanks for any help.
Sumaia