怎样用简便运算做 1.76*0.4*2.3
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 21:13:30
![怎样用简便运算做 1.76*0.4*2.3](/uploads/image/z/134733-21-3.jpg?t=%E6%80%8E%E6%A0%B7%E7%94%A8%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E5%81%9A+1.76%2A0.4%2A2.3)
怎样用简便运算做 1.76*0.4*2.3
怎样用简便运算做 1.76*0.4*2.3
怎样用简便运算做 1.76*0.4*2.3
1.76*0.4*2.3 = 1.1*1.6*0.4*2.3
可以用2.3-1.1 = 1.6-0.4 = 1.2
原式 = (2.3^2 + 1.1^2 - 1.2^2)/2 * (1.6^2 + 0.4^2 - 1.2^2)/2
也可以利用2.3+0.4 = 1.1+1.6 = 2.7
原式 = (2.7^2 - 2.3^2 - 0.4^2)/2 * (2.7^2 - 1.1^2 - 1.6^2)/2
1.76*0.4*2.3 = 1.76*0.4*2.5 - 1.76*0.4*0.2
= 1.76 - 1.76*0.08
= 1.76 - 1.76*0.1 + 1.76*0.02