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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tính số hữu tỉ x biết: a) 7/6 – x = 16/9 b) x × 8/5 = 26/7

Toán Lớp 7: Tính số hữu tỉ x biết:
a) 7/6 – x = 16/9
b) x × 8/5 = 26/7

Comments ( 2 )

  1. a) 7/6 – x = 16/9

    x = 7/6 -16/9

    x=21/18 – 32/18

    x=(21-32)/18

    x=(-11)/18

    Vậy: x=(-11)/18

    b)x . 8/5 = 26/7

    x=26/7: 8/5

    x=26/7 . 5/8

    x=(130)/56

    x=65/28

    Vậy: x=65/28

  2. a,7/6-x=16/9
    ⇔x=7/6-16/9
    ⇔x=63/54-96/54
    ⇔x=(63-96)/54
    ⇔x=-33/54=-11/18
    Vậy x=-11/18
    b,x xx 8/5=26/7
    ⇔x=26/7:8/5
    ⇔x=26/7xx5/8
    ⇔x=(26xx5)/(7xx8)
    ⇔x=65/28
    Vậy x=65/28

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222-9+11+12:2*14+14 = ? ( )