1.2 a=1.2 a=2; b=3; a+b 2^10 2**10 1+2*3**4 1+2*(3**4) 1+(2*3)**4 (1+2)*3**4 1+((2*3)**4) 1+(2*(3**4)) (1+(2*3))**4 ((1+2)*3)**4