15.4-5.4x0.19的简便脱式计算解:采用分配律,原式=15.4-5.4x0.19=15.4-5.4x(2-0.01)=15.4-5.4x2+5.4x0.01=15.4-10.8+0.0054=4.6+0.0054=4.6054
15.4-5.4x0.19=15.4+5.4x0.01-5.4x0.01-5.4x0.19=15.4+0.054-5.4x(0.01+0.19)=15.454-5.4x0.2=15.454-1.08=14.374