分类：教育/科学-学习帮助
问题：巧算(1)37.9*0.0038+1.21*0.379+6.21 
(1)37.9*0.0038+1.21*0.379+6.21*0.159
(2)211*(-455)+365*455-211*545+545*365
回答：37.9*0.0038+1.21*0.379+6.21*0.159 
=37.9*0.0038+0.0121*37.9+6.21*0.159 
=37.9*0.0159+6.21*0.159 
=37.9*0.0159+62.1*0.0159 
=100*0.0159 
=1.59


211*455+365*455-211*545+545*365 
=211*(-455-545)+365*(455+545) 
=(455+545)*(365-211) 
=1000*154 
=154000