1÷0.5= 5÷40= 2.4×3= 0.8×0.5= 12-8.9=
3.2÷0.8= 4.01÷100= 1.7×0.5= 2.5×400= 13÷0.001=
3.2×50= 4.6+2.9= 0.47+1.8= 299+324= 0.6÷5=
6.7-2.9= 23×2.7+77×2.7= 5.4+0.74+4.6=
分析:本題根據(jù)小數(shù)的加法,減法,乘法,除法的運算法則計算即可;
12-8.9、4.6+2.9、299+324、6.7-2.9可用湊整法計算;
23×2.7+77×2.7可根據(jù)乘法分配律計算;
5.4+0.74+4.6可根據(jù)加法交換律計算.
解答:解:
1÷0.5=2, 5÷40=0.125, 2.4×3=7.2, 0.8×0.5=0.4, 12-8.9=3.1,
3.2÷0.8=4, 4.01÷100=0.0401, 1.7×0.5=0.85, 2.5×400=1000, 13÷0.001=13000,
3.2×50=160, 4.6+2.9=7.5, 0.47+1.8=2.27, 299+324=623, 0.6÷5=0.12,
6.7-2.9=3.8, 23×2.7+77×2.7=270, 5.4+0.74+4.6=10.74.
點評:完成本題要細心分析式中數(shù)據(jù),然后快速準確得出答案.
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