简算:139×137/138+137×1/138 请尽快!
人气:375 ℃ 时间:2020-04-30 03:22:09
解答
(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
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