仙草愛玉 發問時間: 科學數學 · 1 0 年前

等值分數與分數加減怎麼算?

請教各位幾題數學,麻煩告訴我怎麼算!

說起來真的好慚愧,因為小弟我數學很差

不知如何教還在讀國小的弟弟

等值分數與分數加減(最簡)的問題~

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3 個解答

評分
  • 政文
    Lv 7
    1 0 年前
    最佳解答

    1. 8/6 = 4/3 = 12/9 = 16/12 是正確的

    2. 15/10 = ?/4 (利用15*4 = 10*? --> ?=6)

    15/10 = 9/? (利用10*9 = 15*? --> ?=6)

    3. 8/4 = 4/2 = 2/1 = 2 (因為2/1本來就是2,很簡單)

    4. 5/8 = 10/12 = 15/16是錯的

    正確為:5/2 = 10/16 = 15/24

    5. 2/14 = 3/21 = 5/35是正確的

    6. 12/18 = 6/9 = 10/15

    7. 10/9 + 30/27 = 30/27 + 30/27 = 60/27 = 20/9 是正確的

    8. 6*5/9 - 3*17/18 = 59/9 - 71/18 = 118/18 - 71/18 = 47/18

    9. 3/4 + 5/16 + 11/32 = 24/32 + 10/32 + 11/32 = 45/32

    10. 1*3/14 + 19/21 = 17/14 + 19/21 = 51/42 + 38/42 = 89/42

    11. 13/15 - 19/30 = 26/30 - 19/30 = 7/30

    12. 7/18+17/12 = 14/36 + 51/36 = 65/36

    13. 3-1*1/12 = 36/12 - 13/12 = 23/12

    14. 1*3/5 + 2*3/8 = 8/5 + 19/8 = 64/40 + 95/40 = 159/40

  • 1 0 年前

    1.8/6=4/3=12/9=16/12

    →這一題是對的

    2.15/10=?/4=9/?

    →15/10=3/2=6/4=9/6

    →第一個問號和第二個問號都是6

    3.8/4=4/2=2/1=?

    →問號就是2

    分母是1就可以不理分母了

    4.5/8=10/12=15/16

    →這一題是錯的

    →應該是5/8=5*2/8*2=10/16=15/24

    5.2/14=3/21=6/35

    →這一題是對的

    6.12/18=?/9=10/?

    →12/18=2/3=6/9=10/15

    →第一個問號是6,第二個問號是15

    7.10/9+30/27=30/27+30/27=60/27=20/9

    這一題是對的

    8.(6+5/9)-(3+17/18)=3+10/18-17/18=2+11/18

    9.3/4+5/16+11/32=24/32+10/32+11/32=45/32

    10.(1+3/14)+19/21=1+9/42+38/42=1+47/42=2+5/42

    11.13/15-19/30=26/30-19/30=7/30

    12.7/18+17/12=14/36+51/36=65/36=1+29/36

    13.3-(1+1/12)=2-1/12=1+11/12

    14.(1+3/5)+(2+3/8)=3+3/5+3/8=3+24/40+15/40=3+39/40

    註:1+3/5就是一又五分之三

  • 1 0 年前

    8 / 6 = 4 / 3 = 12 / 9 = 16 / 12 .......正確

    15 / 10 = 6 / 4 = 9 / 6

    8 / 4 = 4 / 2 = 2 / 1 = 2

    5 / 8 = 10 / 16 = 16 / 24 ....... 你的答案不正確

    2 / 14 = 3 / 21 = 5 / 35 ....... 正確

    12 / 18 = 6 / 9 = 10 / 15

    10 / 9 + 30 / 27 = 30 / 27 + 30 / 27 = 60 / 27 = 20 / 9 ....... 正確

    2007-08-23 14:55:04 補充:

    ( 6 + 5 / 9 ) - ( 3 + 17 / 18 ) = 59 / 9 - 71 / 18 = 118 / 18 - 71 / 18 = 47 / 18 = 2 + 11 / 18

    3 / 4 + 5 / 16 + 11 / 32 = 24 / 32 + 10 / 32 + 11 / 32 = 45 / 32 = 1 + 13 / 32

    ( 1 + 3 / 14 ) + 19 / 21 = 17 / 14 + 19 / 21 = 51 / 42 + 38 / 42 = 89 / 42 = 2 + 5 / 42

    2007-08-23 14:55:22 補充:

    13 / 15 - 19 / 30 = 26 / 30 - 19 / 30 = 7 / 30

    7 / 18 + 17 / 12 = 14 / 36 + 51 / 36 = 65 / 36 = 1 + 29 / 36

    3 - ( 1 + 1 / 12 ) = 36 / 12 - 13 / 12 = 23 / 12 = 1 + 11 / 12

    ( 1 + 3 / 5 ) + ( 2 + 3 / 8 ) = 8 / 5 + 19 / 8 = 64 / 40 + 95 / 40 = 159 / 40 = 3 + 39 / 40

    2007-08-24 01:07:34 補充:

    5 / 8 = 10 / 16 = 15 / 24 ....... 你的答案不正確

    拍謝! 我也打錯了. 麻煩您自行更正

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