杭州交通信息网汉中市三甲医院名单:小学奥数高手高手高高手请留步！
来源：百度文库 编辑：杭州交通信息网 时间：2024/05/06 01:09:12
（1）3.6*31.4+43.9*6.4=?
(2)345670*345670-364569*345671=?
简便方法，谢谢！
(2)345670*345670-364569*345671=?
简便方法，谢谢！
3.6*31.4+43.9*6.4=3.6*31.4+(31.4+12.5)*6.4
=(3.6+6.4)*31.4+12.5*8*0.8
=314+80=394
345670*345670-345669*345671
=345670*345670-(345670-1)(345670+1)
=345670*345670-345670*345670+1
=1
(1)3.6*31.4+(10-3.6)*43.9
=3.6*31.4+439-3.6*43.9
=439-3.6(43.9-31.4)
=439-3.6*12.5
=439-3.6*(100/8)
=439-360/8=439-45=394
(2)345670*345670-(375670-1)*(345670+1)
=345670*345670-345670*345670+1
=1