7.36-5.4+1.76-1.6
=7.36-（5.4+1.6）+1.76
=0.36+1.76
=2.12很好，6.7+5.8-2.1+3.3怎样简便6.7+5.8-2.1+3.3=（6.7+3.3）+（5.8-2.1）=10+3.7=13.7