①4.56+5.44×0.2 按顺序 ②0.75×12.5 用简便计算_数学解答

①4.56+5.44×0.2 按顺序 ②0.75×12.5 用简便计算

人气：288 ℃　时间：2020-04-13 19:31:47

解答

①4.56+5.44×2
=4.56+5.44+5.44
=10+5.44
=15.44
②0.75×12.5
=(0.8-0.05)×12.5
=10-0.625
=9.375
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