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

Toán Lớp 6: a) x-12=-28 b) 20+8.(x+3)=5 mũ 2 . 4

Toán Lớp 6: a) x-12=-28 b) 20+8.(x+3)=5 mũ 2 . 4

Comments ( 2 )

  1.    Ron
    a) x – 12 = -28
        x         = -28 + 12 
        x         = -16
    Vậy x = -16
    b) 20 + 8 . (x + 3) = 5$^{2}$ . 4
         20 + 8 . (x + 3) = 25 . 4 
         20 + 8 . (x + 3) = 100
                  8 . (x + 3) = 100 – 20
                  8 . (x + 3) = 80
                        x + 3   = 80 : 8
                        x + 3   = 10
                        x          = 10 – 3
                        x          = 7
       Vậy x = 7
       #Chúc bạn học tốt
      Xin hay nhất

  2. a) x – 12 = -28
        x = -28 + 12
        x = – ( 28 – 12 )
        x = – 16
    _________________________
    b) 20 + 8 . ( x + 3 ) = 5^2 . 4
        20 + 8x + 24 = 25 . 4
        8x + 44 = 100
        8x = 100 – 44
        8x = 56
        x = 56 : 8
        x = 7

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

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