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

Toán Lớp 6: Các bạn giúp mình bài tìm x nhé A) x : 2 = x : 3 B) ( 4x + 5 ) : 3 – 121 : 11 = 4 C) 5x – x = 84

Toán Lớp 6: Các bạn giúp mình bài tìm x nhé
A) x : 2 = x : 3
B) ( 4x + 5 ) : 3 – 121 : 11 = 4
C) 5x – x = 84

Comments ( 2 )

  1. a , x : 2 = x : 3
    => x/2 = x/3
    => 3x = 2x
    => 3x – 2x = 0
    => x = 0
    $\text{Vậy}$ x = 0
    ___________________
    b, (4x + 5) : 3 – 121 : 11 = 4
    => (4x + 5) : 3 – 11 = 4
    => (4x + 5) : 3 = 4 + 11
    => (4x + 5) : 3 = 15
    => (4x + 5) = 15 . 3
    => 4x + 5 = 45
    => 4x = 45 – 5
    => 4x = 40
    => x = 40 : 4
    => x = 10
    $\text{Vậy}$ x = 10
    _____________________
    c, 5x – x = 84
    => 4x = 84
    => x = 84 : 4
    => x = 21
    $\text{Vậy}$ x = 21
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a) $x \div 2 = x \div 3 \\\Leftrightarrow x \div 2 – x \div 3 = 0 \\\Leftrightarrow x ( \cfrac{1}{2} – \cfrac{1}{3} ) = 0 \\\Leftrightarrow x = 0$
     Vậy, x = 0
    b)  $ \cfrac{4x + 5}{3} – \cfrac{121}{11} = 4 \\\Leftrightarrow \cfrac{4x + 5}{3} = 15 \\\Leftrightarrow 4x + 5 = 45 \\\Leftrightarrow 4x = 40 \\\Leftrightarrow x = 10 $
    Vậy, x = 10
    c) $5x – x = 84 \\\Leftrightarrow 4x = 84 \\\Leftrightarrow x = 84 \div 4 = 21$
    Vậy, x = 21

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

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