简算:139×137/138+137×1/138 请尽快!
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/12 13:06:51
简算:139×137/138+137×1/138 请尽快!
![简算:139×137/138+137×1/138 请尽快!](/uploads/image/z/8611923-3-3.jpg?t=%E7%AE%80%E7%AE%97%EF%BC%9A139%C3%97137%2F138%2B137%C3%971%2F138+%E8%AF%B7%E5%B0%BD%E5%BF%AB%21)
(138+1)×(138-1)/138+(138-1)×1/138
=(138*138-1)/138+(138-1)×1/138
=138-1/138+1-1/138
=139-2/138
=138+136/138
=138+68/69
=(138*138-1)/138+(138-1)×1/138
=138-1/138+1-1/138
=139-2/138
=138+136/138
=138+68/69