(69.9-4.74-5.16)*6.5怎么简便计算

分类: 作业答案 • 2022-02-21 18:20:22

问题描述：

答

=[69.9-(4.74+5.16)]*6.5
=(69.9-9.9)*6.5
=60*6.5
=390

答

(69.9-4.74-5.16)*6.5
＝(69.9-（4.74+5.16）)*6.5
＝(69.9-9.9)*6.5
＝60*6.5
＝60*6+60*0.5
＝360+30
＝390