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

Toán Lớp 6: tìm số x , biết a) x + 30 = – 4 b) 23 – 5.x = 3 c. (2x – 5) + 17 = 6

Toán Lớp 6: tìm số x , biết
a) x + 30 = – 4
b) 23 – 5.x = 3
c. (2x – 5) + 17 = 6

Comments ( 2 )

  1. a)$\text{ x + 30 = – 4}$
    $\text{<=>x = -4 -30}$
    $\text{<=>x = -34}$
    $\text{b) 23 – 5.x = 3}$
    $\text{<=> -5x = 3 -23}$
    $\text{<=> -5x = -20}$
    $\text{<=> x = 4}$
    $\text{c) (2x – 5) + 17 = 6}$
    $\text{<=> 2x-5+17 =6}$
    $\text{<=> 2x +12  = 6}$
    $\text{<=> 2x         = 6-12}$
    $\text{<=> 2x            = -6}$
    $\text{<=> x               = -3}$
    MAXY
     

  2. a) x + 30 = – 4
        x  = – 4 +30
        x   = 26
    b) 23 – 5.x = 3
                5x = 23 – 3
                5x  = 20
                  x = 20 : 5
                  x = 4
    c. (2x – 5) + 17 = 6
        2x – 5            = 6 – 17
       2x – 5             = -11
       2x                  = -11 + 5
       2x                  = -6
         x                  = -6 : 2
         x                  = -3

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