94乘1999减93乘2000等?

问题描述:

94乘1999减93乘2000等?

94x1999-93x2000
=94x(2000-1)-93x2000
=94x2000-94x1-93x2000
=94x2000-93x2000-94
=(94-93)x2000-94
=1x2000-94
=2000-94
=1906