L'exercice 61 comment on fait please ?

a/ 3² x 4 = 9 x 4 = 36    
 
b/ 5 x 2^4  = 5 x 16 = 80    

d/ 2^3 x 3^3 = 8 + 27 = 35  

e/ 7² - 4^3 = 49 - 64 = -15