①4.56+5.44×0.2 按顺序 ②0.75×12.5 用简便计算

问题描述:

①4.56+5.44×0.2 按顺序 ②0.75×12.5 用简便计算

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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