(90+1/88)x1/89 怎么简便运算
问题描述:
(90+1/88)x1/89 怎么简便运算
答
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