问题
填空题
37.9×0.0038+1.21×0.379+6.21×0.159=______．
答案
原式=37.9×0.0038+0.0121×37.9+6.21×0.159，
=37.9×（0.0038+0.0121）+6.21×0.159，
=37.9×0.0159+6.21×0.159，
=0.159×（3.79+6.21），
=0.159×10，
=1.59．
故答案为：1.59．
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