(4/5+1/3)+(1-1/5+2/3)的简便算法
问题描述:
(4/5+1/3)+(1-1/5+2/3)的简便算法
暂时没钱,
答
(4/5+1/3)+(1-1/5+2/3)
=4/5-1/5+1/3+2/3
=3/5+1
=1又3/5