5.7×8.3+0.57×12+57×0.05的简便运算为：=5.7×8.3+0.57×12+57×0.05=5.7×8.3+((0.57×10)×(12÷10))+((57÷10)×(0.05×10))=5.7×8.3+5.7×1.2+5.7×0.05=5.7×(8.3+1.2+0.5)=5.7×10=57
