equation code not getting right answer

Hello, I'm trying to code this expression, this is my attempt but I'm not getting the same answer/value, not sure what I'm doing wrong. Any help/guidance will be appreciated.

% Given values
%AInfinity = 1;
%AInlet = 6.5;
MInlet = 0.5;
MInfinity = 2;
gamma = 1.4;

a = (1 + (gamma-1/2)* MInfinity^2)

b = (1 + (gamma-1/2)* MInlet^2)

b1 = (MInlet/MInfinity)

r = b1*(a/b)^(gamma + 1/(2*gamma -1))

Answer 1

[VBBV]

% Given values
%AInfinity = 1;
%AInlet = 6.5;
MInlet = 0.5;
MInfinity = 2;
gamma = 1.4;

a = (1 + ((gamma-1)/2)* MInfinity^2)  % for numerator 

a = 1.8000

b = (1 + ((gamma-1)/2)* MInlet^2)  % for numerator

b = 1.0500

b1 = (MInlet/MInfinity)

b1 = 0.2500

r = b1*(a/b)^((gamma + 1)/(2*(gamma -1)))  % for num and den

r = 1.2595

[VBBV]

use the parenthesis for num & den in the expression

[Cesar Cardenas]

Thank you, I just would like to know if these are well coded? Thanks

p02 = pa * (1 + eta_d * (gamma - 1) / 2 * Ma^2) ^ (gamma / (gamma - 1))

p2 = p02 * (1 + (gamma - 1) / 2 * M2^2) ^ (gamma / (gamma - 1))

[Torsten]

I just would like to know if these are well coded?

Yes, the two expressions are correctly coded.