a,=638+789-41=1386
b,600:[450:(450-300)]=600:(450:150)=600:3=200
\(d=\)số số hạng :(100-1):1+1=100
tổng là: (100+1).100:2=5050
c,=72.(48+18)+8.9.34=72.66+2448=4752+2448=7200
e,=758.16-483.3:4=12128-1449:4=12128-362,25=11765,75
g,=37.(124-45)=37.80=2960
h,=19+22+59=100