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Fw: [問卦] 這個國小數學題是不是有點難

[ CS_TEACHER ]6 留言, 推噓總分: +2

作者: ukalm - 發表於 2015/01/09 14:43(11年前)

346^F推tsunamimk2: 被減數多了5,減數少了0.5,一來一回就多了5.5 結束01/09 13:18

351^F→tsunamimk2: 用代數只是方便描述問題但他說穿了就只是多了5.5...01/09 13:19

356^F→tsunamimk2: 那麼寫成英文吧01/09 13:21

360^F→tsunamimk2: 被減數是上面那個,3->8 +501/09 13:21

374^F推tsunamimk2: 喔好問題沒有說是正實數,還得考慮虛部01/09 13:23

376^F→tsunamimk2: 沒有人說原來的兩個數是正實數01/09 13:23

382^F→tsunamimk2: 所以就說正實數的話就是多了5.5啊01/09 13:25

391^F→tsunamimk2: 為什麼要懷疑是多5.5(抓頭01/09 13:27

394^F→tsunamimk2: 這不是一眼就看出來的嗎..只是沒考慮原數可能是負數01/09 13:27

402^F→tsunamimk2: 上面有人推了如果被減數是負的那就不是多5 而是少501/09 13:29

406^F→tsunamimk2: 如果x<0 等式會變成x-8...01/09 13:31

408^F→tsunamimk2: 因為-3-8=-11吧01/09 13:32

412^F→tsunamimk2: -0.8-(-0.3) = -0.501/09 13:33

415^F→tsunamimk2: 被減數為-33->-38,減數正的好了0.8->0.3,正確應該是?01/09 13:35

416^F→tsunamimk2: 幹我忘了減起來應該是27.5..XDDD01/09 13:35

419^F→tsunamimk2: 抱歉抱歉想太少了01/09 13:36

420^F→tsunamimk2: 代數字最快不用想01/09 13:36

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