1,53x54-0,42x(512-491,2)+1,116

1.53*54-0.42*20.8+1.116=82.62-8.736+1.116=75
 б) (70.2*0.007-0.0314)*100=(0.4914-0.0314)*100=0.46*100=46

решение 
1) 512-491,2=20,8 
2)20,8*0,42=8,736 
3)1,53*54=82,62 
4)82,62-8,736=73,884 
5)73,884+1,116=75