125×4×8×25

=( 125×8)×(25×4)

This should be counted in brackets first, which is very simple. If you don't put brackets, that is

125×4×8×25

= 125×8×25×4

According to the calculation rules of mixed operation, it should be calculated from left to right in turn, not successively and then in the middle.

So if you want to calculate the multiplication before and after, you must put parentheses.

Ask the teacher tomorrow, mine is absolutely right.