计算:784070+78407.1+7840.72+784.073+78.4074=______.
问题描述:
计算:784070+78407.1+7840.72+784.073+78.4074=______.
答
784070+78407.1+7840.72+784.073+78.4074
=784070×(1+0.1+0.01+0.001+0.0001)+0.1+0.02+0.003+0.0004
=784070×1.1111+0.1234
=871180.3004
故答案为:871180.3004.
答案解析:通过观察,此题数字有相似之处,因此通过数字拆分,变为784070×(1+0.1+0.01+0.001+0.0001)+0.1+0.02+0.003+0.0004,计算即可.
考试点:小数的巧算.
知识点:完成此题,注意数字的拆分,运用运算定律,巧妙解答.