18.75减0.23乘以2减4.54和（4.2加4.2除以2.1）除以0.2和0.5乘以【（0.09加1.29）除以0.23】能不能简便?

能简便18.75-0.23×2-4.54=18.75-0.46-4.54=18.75-(0.46+4.54)=13.754.2+4.2÷2.1÷0.2＝4.2+4.2÷（2.1×0.2）＝4.2+4.2÷0.42＝4.2+10＝14.20.5×（0.09+1.29）÷0.23＝0.5×1.38÷0.23＝0.5×6＝3