87×
2
5
+12÷
5
2
+40%
分析:完成本題先根據(jù)除法的計算法則將12÷
5
2
化為乘法算式后,再將式的分數(shù)化為小數(shù),然后根據(jù)乘法分配律計算.
解答:解:87×
2
5
+12÷
5
2
+40%
=87×
2
5
+12×
2
5
+40%,
=87×0.4+12×0.4+0.4,
=(87+12+1)×0.4,
=100×0.4,
=40.
點評:當算式中同時含有分數(shù)、小數(shù)、與百分數(shù)時,可根據(jù)式中數(shù)據(jù)的特點靈活將它們互化,以達到簡便計算的目的.
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