Mathématiques

Question

faire les fraction et simpifier 3/21+5/7 ; 17/15-3/5 ; 9/8+5/12 ; 11/15-3/20 ; -2/25+-3/25 ; -9/8-6/4 ; -4/14+-3/21 ; -5/18 - (- 2/27)

2 Réponse

  • 3/21 + 5/7=3/21 + 15/21=18/21
    17/15 - 3/5=17/15 - 9/15=8/15
    11/15 - 3/20=44/60 - 9/60=35/60=7/12
    -2/25 + -3/25=-5/25=-1/5
    -9/8 - 6/4=-9/8 - 12/8=21/8

  • 3/21 +5/7 
    3/21 +5/7 X 3/3
    3/21 +15/21
    18/21

    17/15 -3/5
    17/15 -3/5 X 3/3
    17/15 -9/15
    8/15

    9/8 +5/12
    9/8 X 12/12 +5/12 X 8/8
    108/96 + 40/96
    148/96 = 74/48 = 37/24

    11/15 -3/20
    11/15 X 4/4 -3/20 X 3/3
    44/60 -9/60
    35/60 = 7/12

    -2/25 -3/25 = -5/25 = -1/5

    -9/8 -6/4
    -9/8 X 4/4 -6/4 X 8/8
    -36/32 -48/32
    -84/32 = -42/16 = -21/8 

    -4/14 -3/21
    -4/14 X 21/21 -3/21 X 14/14
    -84/294 - 42/294
    -126/294 = -42/98 = -21/49 = -3/7

    -5/18 -(-2/27)
    -5/18 + 2/27
    -5/18 X 27/27 +2/27 X 18/18
    -135/486 + 36/486
    -99/486 = -11/54

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