knrt.net
当前位置:首页 >> 354x7+360+355十347简便算法 >>

354x7+360+355十347简便算法

=355×7-7+355+5+355+355-8 =355×10-10=3540

原式=354x7+354+6+354+1+354-7=354x7+354x3+7-7=354x(7+3)=354x10=3540

65x70+36x70-1x70=(65+36-1)x70=100x70=7000

=36×10×7.2+74×72-72×10 =36×72+74×72-72×10 =72×(36+74-10) =72×100 =7200

网站首页 | 网站地图
All rights reserved Powered by www.knrt.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com