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

Toán Lớp 6: Tìm số nguyên x biết a) |x + 2|= 0 b) |x – 5 |=|-7| c) |x – 3|= 7 – (-2) d) (7 – x) – (25+7) = -25 e) |x – 3|= |5|+ |-7| f) 4 – ( 7 –

Toán Lớp 6: Tìm số nguyên x biết
a) |x + 2|= 0
b) |x – 5 |=|-7|
c) |x – 3|= 7 – (-2)
d) (7 – x) – (25+7) = -25
e) |x – 3|= |5|+ |-7|
f) 4 – ( 7 – x) = x – (13 – 4)
g) ( x + 2)(x – 3) > 0
h) (x – 3)(x – 4) < 0 i) - |x + 2016|- 2017 « - 2017 j) |x + 15|+ |x - 17|» 32

Comments ( 1 )

  1. a) |x + 2| = 0
         x + 2  = 0 
         x         = 0 – 2
         x         = -2
    b) |x – 5| = |-7|
        |x – 5| = 7
    TH1: x – 5 = 7            TH2: x – 5 = -7
            x       = 7 + 5             x       = (-7) + 5
            x       = 12                  x       = -2
    c) |x – 3| = 7 – (-2) 
        |x – 3| = 9
    TH1: x – 3 = 9          TH2: x – 3 = -9
            x       = 9 + 3            x       = (-9) + 3
            x       = 12                x        = -6
    d) (7 – x) – (25 + 7) = -25
        (7 – x) – 32 = -25
         7 – x          = (-25) + 32
         7 – x           = 7
              x            = 7 – 7
              x            = 0
     

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

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