Using the rules of precedence, multiply or divide and add or subtract:
999999999999−3333×83+8384÷34829
999999999999−276639+8384÷34829
999999999999−276639+0.240718941
999999723360+0.240718941
999999723360.240718941
Performing in the order presented:
999999999999−3333×83+8384÷34829
999999996666×83+8384÷34829
8.299999972×10¹³+8384÷34829
8.299999973×10¹³÷34829
2383071570.57802406
As you can see, changing the order of operations makes a difference and the reason why there is a rule of precedence in performing mathematical operations.