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

Toán Lớp 6: Tìm số nguyên x : a) ( -5 ) + x = 7 b ) ( – 14 ) – x + ( – 15 ) = – 10 c ) 12 + x + ( – 5 ) = -18 d) x – ( – 19 ) – ( – 11 ) = 0

Toán Lớp 6: Tìm số nguyên x :
a) ( -5 ) + x = 7
b ) ( – 14 ) – x + ( – 15 ) = – 10
c ) 12 + x + ( – 5 ) = -18
d) x – ( – 19 ) – ( – 11 ) = 0

Comments ( 2 )

  1. a) ( -5 ) + x = 7
                    x = 7 – ( – 5 ) 
                    x = 12
    ———————————-
    b ) ( – 14 ) – x + ( – 15 ) = – 10
          ( – 14 ) – x               = – 10 -( – 15 )
          ( – 14) – x               =   5
                         x               = -14 – 5
                          x              = – 19
    —————————————
    c ) 12 + x + ( – 5 ) = -18
         12 + x              = – 18 – ( – 5)
          12 + x              = 23
                  x               = 23 – 12
    —————————————–
    d) x – ( – 19 ) – ( – 11 ) = 0
        x – ( -19)                  = 0 + ( – 11)
        x – ( -19)                  = -11
         x                             = – 11 + ( – 19)
         x                             = -30

  2. a) ( -5 ) + x = 7
    <=>x=7-(-5)=7+5=12
    Vậy x=12
    b ) ( – 14 ) – x + ( – 15 ) = – 10
    <=>- 14 – x  – 15  = – 10
    <=>-x=-10+14+15
    <=>-x=19
    <=>x=-19
    Vậy x=-19
    c ) 12 + x + ( – 5 ) = -18
    <=>x+7=-18
    <=>x=-18-7=-25
    Vậy x=-25
    d) x – ( – 19 ) – ( – 11 ) = 0
    <=>x+19+11=0
    <=>x+30=0
    <=>x=-30
    Vậy x=-30
     

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