80%*45-60%/四十五分之一的简便算法日后必有重谢!
问题描述:
80%*45-60%/四十五分之一的简便算法
日后必有重谢!
答
45*(80%-60%)=45*20%=9
答
80%*45-60%/(1/45)
=80%*45-60%*45
=45*(80%-60%)
=9