Analysis: It is known that Xiaoming scored an average of 95 in five math competitions and 96 in the first three competitions, so (94+96)×3-95×5=570-475=95 (points).

The essence of multiplication:

If the dependent variable f and the independent variables x 1, x2, x3, ... ….xn are qualitatively different from each independent variable, it will lose its meaning without any independent variable f, which is called multiplication.

If a multiplication is added to a group, it will develop into a "ring". One of the two multiplications can be regarded as addition in the traditional sense, so it is required to satisfy the distribution law and the exchange law. But it's another multiplication that doesn't need a commutative law.