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

Toán Lớp 7: a)2/3x+-1/2x = -5/12 b)3/4(x-8)=5/7(14-7/2) Giải giúp e vs ạ ,e cảm ơn

Tháng Tám 14, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a)2/3x+-1/2x = -5/12
b)3/4(x-8)=5/7(14-7/2)
Giải giúp e vs ạ ,e cảm ơn

Comments ( 2 )

  1. huongtructram
    huongtructram
    14 Tháng Tám, 2022 at 11:35 chiều
    Reply
    a, 2/3x – 1/2x = -5/12
    $\Leftrightarrow$ 1/6x = -5/12
    $\Leftrightarrow$ x = -5/12 : 1/6
    $\Leftrightarrow$ x = -5/2
    $\text{Vậy}$ x = -5/2
    ___________________
    b, 3/{4 . (x – 8)} = 5/{7.(14 – 7/2)}
    $\Leftrightarrow$ 3/{4x – 32} = 5/{7 . 21/2}
    $\Leftrightarrow$ 3/{4x – 32} = 5/{147/2}
    $\Leftrightarrow$ 3 . 147/2 = 5 . (4x – 32)
    $\Leftrightarrow$ 5 . (4x – 32) = 3 . 147/2
    $\Leftrightarrow$ 5 . (4x – 32) = 441/2
    $\Leftrightarrow$ (4x – 32) = 441/2 : 5
    $\Leftrightarrow$ 4x – 32 = 441/10
    $\Leftrightarrow$ 4x = 441/10 + 32
    $\Leftrightarrow$ 4x = 761/10
    $\Leftrightarrow$ x = 761/10 : 4
    $\Leftrightarrow$ x = 761/40
    $\text{Vậy}$ x = 761/40

  2. dongoclandiem
    dongoclandiem
    14 Tháng Tám, 2022 at 11:35 chiều
    Reply
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a,
    2/3x – 1/2x = -5/12
    1/6x = -5/12
    x = -5/12 : 1/6
    x = -5/2
    b,
    3/4 . (x – 8) = 5/7.(14 – 7/2)
    3/{4x – 32} = 5/{7 . 21/2}
    3/{4x – 32} = 5/{147/2}
    3 . 147/2 = 5 . (4x – 32)
    5 . (4x – 32) = 3 . 147/2
    5 . (4x – 32) = 441/2
    (4x – 32) = 441/2 : 5
    4x – 32 = 441/10
    4x = 441/10 + 32
    4x = 761/10
    x = 761/40

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

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