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

Toán Lớp 6: tìm số nguyên x,biết a.8.x=64 b.(-5).x=25 c.4.x+1=21 d.(-3).x-1=8 giúp mik vs mik vote 5 sao ak

Toán Lớp 6: tìm số nguyên x,biết
a.8.x=64
b.(-5).x=25
c.4.x+1=21
d.(-3).x-1=8
giúp mik vs mik vote 5 sao ak

Comments ( 2 )

  1. $\text{ a) 8x = 64 }$
    $\Rightarrow$ $\text{ x = 64 : 8 }$
    $\Rightarrow$ $\text{ x = 8 }$
      $\text{ Vậy x = 8 }$
    $\text{ b) ( -5 ). x = 25 }$
    $\Rightarrow$ $\text{ x = 25 : ( -5 ) }$
    $\Rightarrow$ $\text{ x = -5 }$
      $\text{ Vậy x = -5 }$
    $\text{ c) 4x + 1 = 21 }$
    $\Rightarrow$ $\text{ 4x = 21 – 1 }$
    $\Rightarrow$ $\text{ 4x = 20 }$
    $\Rightarrow$ $\text{ x = 20 : 4 }$
    $\Rightarrow$ $\text{ x = 5 }$
      $\text{ Vậy x = 5 }$
    $\text{ d) ( -3 ). x – 1 = 8 }$
    $\Rightarrow$ $\text{ ( -3 ). x = 8 + 1 }$
    $\Rightarrow$ $\text{ ( -3 ). x = 9 }$
    $\Rightarrow$ $\text{ x = 9 : ( -3 ) }$
    $\Rightarrow$ $\text{ x = -3 }$
      $\text{ Vậy x = -3 }$
     

  2. Lời giải và giải thích chi tiết:
    a)
    8 . x = 64
    => x = 64/8 = 8
    Vậy  x = 8
    b)
    (-5) . x = 25
    => x = 25/(-5) = -5
    Vậy  x = -5
    c)
    4 . x + 1 = 21
    => 4 . x = 21 – 1 = 20
    => x = 20/4 = 5
    Vậy  x = 5
    d)
    (-3) . x – 1 = 8
    => (-3) . x = 9
    => x = 9/(-3) = -3
    Vậy  x = -3

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

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