问题: 巧算
(1)37.9*0.0038+1.21*0.379+6.21*0.159
(2)211*(-455)+365*455-211*545+545*365
解答:
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
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