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

Toán Lớp 6: 3/5x + -1/2 = -7/10 4/15 : x + -1/3 = 5/9 7/4 – 3/4 : x = 7/16

Toán Lớp 6: 3/5x + -1/2 = -7/10
4/15 : x + -1/3 = 5/9
7/4 – 3/4 : x = 7/16

Comments ( 2 )

  1. Giải đáp:
     Bên dưới
    Lời giải và giải thích chi tiết:
     a, 3/5 . x + (-1)/2 = (-7)/10
    ⇔ 3/5 . x = (-7)/10 + 1/2
    ⇔ 3/5.x = (-7)/10 + 5/10
    ⇔ 3/5. x = (-2)/10
    ⇔ 3/5 . x = (-1)/5
    ⇔ x = (-1)/5 : 3/5
    ⇔ x = (-1)/3
    Vậy x = (-1)/3
    b, 4/5 : x + (-1)/3 = 5/9
    ⇔ 4/5 : x = 5/9 + 1/3
    ⇔ 4/5 : x = 5/9 + 3/9
    ⇔ 4/5 : x = 8/9
    ⇔ x = 4/5 : 8/9
    ⇔ x = (4.9)/(5.8)
    ⇔ x = 9/10
    Vậy x = 9/10
    c, 7/4 – 3/4 : x = 7/16
    ⇔ 3/4: x = 7/4 – 7/16
    ⇔ 3/4 : x = 28/16 – 7/16
    ⇔ 3/4 : x = 21/16
    ⇔ x = 3/4 : 21/16
    ⇔ x = ( 3.16)/(4.21)
    ⇔ x = 4/7
    Vậy x= 4/7
    @Active Activity

  2. 3/5x + (-1)/2 = -7/10
    $\Rightarrow$ 3/5x = -7/10 + 1/2
    $\Rightarrow$ 3/5x = -1/5
    $\Rightarrow$ x = -1/5 : 3/5
    $\Rightarrow$ x = -1/5 . 5/3
    $\Rightarrow$ x = -1/3
    $\text{Vậy}$ x = -1/3
    ———————————
    4/15 : x + (-1)/3 = 5/9
    $\Rightarrow$ 4/15 : x = 5/9 + 1/3
    $\Rightarrow$ 4/15 : x = 8/9
    $\Rightarrow$ x = 4/15 : 8/9
    $\Rightarrow$ x = 4/15 . 9/8
    x = 3/10
    $\text{Vậy}$ x = 3/10
    ———————————
    7/4 – 3/4 : x = 7/16
    $\Rightarrow$ 3/4 : x = 7/4 – 7/16
    $\Rightarrow$ 3/4 : x = 21/16
    $\Rightarrow$ x = 3/4 : 21/16
    $\Rightarrow$ x = 3/4 . 16/21
    $\Rightarrow$ x = 4/7
    $\text{Vậy}$ x = 4/7

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