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

Toán Lớp 6: b)5(x + 7) –3x = 13 c)450 : (x –12) = 50

Toán Lớp 6: b)5(x + 7) –3x = 13 c)450 : (x –12) = 50

Comments ( 2 )

  1. b) 5( x + 7) – 3x = 13
    5x + 35 – 3x = 13
    5x – 3x = 13 – 35
    2x = -22
    x = -22 : 2
    x = -11
    Vậy x = -11
    c) 450 : ( x – 12) = 50
    ( x – 12) = 450 : 50
    x – 12 = 9
    x = 9 + 12
    x = 21
    Vậy x = 21
    #caty09
     

  2. Giải đáp +Lời giải và giải thích chi tiết:
    $\text{b) 5( x + 7 ) – 3x = 13}$
    $\text{⇔ 5x + 35 -3x = 13}$
    $\text{⇔ 2x = 13 – 35}$
    $\text{⇔ 2x = -22}$
    $\text{⇔ x = -11}$
    $\text{Vậy: x = -11}$
    $\text{c) 450: ( x – 12) = 50}$
    $\text{⇔ x -12 = 450 : 50}$
    $\text{⇔ x – 12 = 9}$
    $\text{⇔ x = 9 + 12}$
    $\text{⇔ x = 21}$
    $\text{Vậy: x = 21}$
    $\text{HỌC TỐT !!}$

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