铁人精神是什么:72.8*4.5-72.8+72.8*6.5(简便运算)

来源:百度文库 编辑:杭州交通信息网 时间:2024/05/06 11:15:09

=72.8*4.5-72.8*1+72.8*6.5
=72.8*(4.5-1+6.5)
=72.8*10
=728


72.8*4.5-72.8+72.8*6.5
www.google.com 里打出来`` 直接计算出结果
(72.8 * 4.5) - 72.8 + (72.8 * 6.5) = 728

(72.8 * 4.5) - 72.8 + (72.8 * 6.5)
=72.8(4.5+6.5)
=72.8*10
=728

=72.8*(4.5+-1+6.5)
=72.8*10
=728