Question

(90+1/88)x1/89 怎么简便运算

Answer 1

把(90+1/88）变成“89＋89/88”,变一变就简便.
(90+1/88)x1/89
=（89＋89/88）×1/89
=89×1/89 ＋89/88×1/89
=1＋1/88
=1又1/88