E=6/7x 8/13+6/13×9/7-3/13x 6/7 F=- 1/4x 152/11+68/4x-1/11 G=-9/25.53/3-(-3/5) x22/3 tìm x 1) x=-1/2×4/3 2)x/5=5/6 x -30/19

0 bình luận về “E=6/7x 8/13+6/13×9/7-3/13x 6/7 F=- 1/4x 152/11+68/4x-1/11 G=-9/25.53/3-(-3/5) x22/3 tìm x 1) x=-1/2×4/3 2)x/5=5/6 x -30/19”

1. Đáp án:

    

   Giải thích các bước giải:

   `E=6/7 . 8/13+6/13.(9)/7-3/13. 6/7`

   `E = 6/7 . ( 8/13 + 3/13 ) + 6/13 . 9/7 `

   `E = 6/7 . 11/13 + 6/13 . 9/7 `

   `E = 66/91 + 54/91 `

   `E = 120/91 `

   `F=- 1/4. 152/11+68/4.-1/11`

   `F = -38/11 + (-17)/11 `

   `F = -5 `

   `G=-9/25.(53)/3-(-3/5). 22/3`

   `G = -159/25 – (-22)/5 `

   `G = -49/25 `

   tìm `x`

   `1) x = -1/2 . 4/3 `

   `x = -2/3 `

   vậy `x = -2/3 `

   `2)x/5=5/6 . -30/19`

   ` x/5 = -25/19 `

   `x . 29 = -25 . 5 `

   `x.29 = -125 `

   `x = -125 : 29 `

   `x = -125/29 `

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2. *Lời giải :

   `E = 6/7 . 8/13 + 6/13 . 9/7  – 3/13 . 6/7`

   `-> E = 6/7 . 8/13 + 6/7 . 9/13 – 3/13 . 6/7`

   `-> E = 6/7 . (8/13 + 9/13 – 3/13)`

   `-> E = 6/7 . 14/13`

   `-> E = 12/13`

   `F = (-1)/4 . 152/11 + 68/5 . (-1)/11`

   `-> F = (-38)/11 + (-68)/55`

   `-> F = (-258)/55`

   `G = (-9)/25 . 53/3 – (-3)/5 . 22/3`

   `-> G = (-159)/25 – (-22)/5`

   `-> G = (-49)/25`

   Tìm `x`

   `1) x = (-1)/2 . 4/3`

   `-> x = (-4)/6`

   Vậy `x = (-4)/6`

   `2) x/5 = 5/6 . (-30)/19`

   `-> x/5 = (-25)/19`

   `-> x = 5 . (-25)/19`

   `-> x = (-125)/19`

   Vậy `x = (-125)/19`

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