1.9x9.9x0.19简便法
1个回答
2016-10-31
展开全部
解:原式=1.9×(10-0.1)×0.19
=(1.9×10-1.9×0.1)×0.19
=(19-0.19)×0.19
=19×0.19-0.19×0.19
=3.61-0.0361
=3.5739
=(1.9×10-1.9×0.1)×0.19
=(19-0.19)×0.19
=19×0.19-0.19×0.19
=3.61-0.0361
=3.5739
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