Question

18x0.75-3.93怎么算最简便？

Answer 1

18x0.75-3.93
=18x0.75-3.93
=（20-2）x0.75-3.93
=20x0.75-2x0.75-3.93
=15-1.5-3.93
=13.5-3.93
=9.57

Answer 2

把后面3.93拆分一下，提取相同项，使计算简便。
18*0.75-3.6-0.33
=18*0.75-18*0.2-0.33
=18*（0.75-0.2）-0.33
=18*0.55-0.33
=18*0.5+18*0.05-0.33
=9+0.9-0.33
=9.9-0.33
=9.57