Question

（0.75×42.7+57.3-0.573×25）÷3×7972=

199300

．

Answer 1

分析：根据题意，把0.573×25变成57.3×0.25，由乘法分配律，逐步解答即可．

解答：解：（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．

点评：本题利用数字特点经过变换，巧用乘法分配律进行解答即可．