(90+1/88)x1/89 怎么简便运算

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(90+1/88)x1/89 怎么简便运算
(90+1/88)x1/89 怎么简便运算

(90+1/88)x1/89 怎么简便运算
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