简便计算: 2.4×99 , 3.19×7.85+1.15×3.19+3.19

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/26 22:21:06
简便计算: 2.4×99 , 3.19×7.85+1.15×3.19+3.19
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简便计算: 2.4×99 , 3.19×7.85+1.15×3.19+3.19
简便计算: 2.4×99 , 3.19×7.85+1.15×3.19+3.19

简便计算: 2.4×99 , 3.19×7.85+1.15×3.19+3.19
2.4*(100-1)
=2.4*100-2.4*1
=237.6
3.19*7.85+1.15*3.19+3.19
=3.19*7.85+3.19*1.15+3.19*1
=3.19*(7.85+1.15+1)
=31.9

2.4×99=2.4x(100-1)=240-2.4=237.6
3.19×7.85+1.15×3.19+3.19=3.19x(7,85+1.15+1)=3.19x10=31.9

你好!
2.4×99
=2.4×(100-1)
=2.4×100-2.4×1
=240-2.4
=237.6

3.19×7.85+1.15×3.19+3.19
=3.19×7.85+1.15×3.19+3.19×1
=(1.15+7.85+1)×3.19
=10×3.19
=31.9

祝你学习进步,望采纳,谢谢!O(∩_∩)O~