（0.75×42.7+57.3-0.573×25）÷3×7972，

=（0.75×42.7+57.3-57.3×0.25）÷3×7972，

=[0.75×42.7+57.3×（1-0.25）]÷3×7972，

=[0.75×42.7+57.3×0.75]÷3×7972，

=[0.75×（42.7+57.3）]÷3×7972，

=0.75×100÷3×7972，

=75÷3×7972，

=25×7972，

=25×（4×1993），

=25×4×1993，

=100×1993，

=199300．

故答案为：199300．