b = 10 × 100 : 5 × 0 + 9099
b = 1000 : 5 × 0 + 9099
b = 200 × 0 + 9099
b = 0 + 9099
b = 9099
10×100:5×0+9099=
1000:5×0+9099=
500×0+9099=
0+9099=
9099
