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问题: 123

[0.75*42.7-0.573*25+57.3]/3*7972

解答:

[0.75*42.7 - 0.573*25 + 57.3]÷3×7972
=[0.75*42.7 - 57.3*0.25 + 57.3*1]÷3×7972
=(0.75*42.7 + 57.3*(1-0.25)]÷3×7972
=(0.75*42.7 + 57.3*0.75)]÷3×7972
=(42.7+57.3)×0.75÷3×(8000-28)
=100×0.25×4×(2000-7)
=100×1993
=199300