(1/15+3/49)*15-1/49 简便计算
问题描述:
(1/15+3/49)*15-1/49 简便计算
今天就要写好的,各位大哥大姐,帮帮小妹吧!
答
(1/15+3/49)*15-1/49
=1/15*15+3/49*15-1/49
=1+45/49-1/49
=1+(45/49-1/49)
=1+44/49
=1又44/49