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

Toán Lớp 6: Tính nhanh : 2678 : [462 – 2(x + 6)] = 13 2678 : [462 – 2(x – 6)] = 13

Toán Lớp 6: Tính nhanh :
2678 : [462 – 2(x + 6)] = 13
2678 : [462 – 2(x – 6)] = 13

Comments ( 2 )

  1. 2678:[462-2(x+6)]=13
    462-2(x+6)=2678:13
    462-2(x+6)=206
    2(x+6)=462-206
    2(x+6)=256
    x+6=256:2
    x+6=128
    x=128-6
    vậy x=122
    2678 : [462 – 2(x – 6)] = 13
    462 – 2(x – 6)=2678:13
    462 – 2(x – 6)=206
    2(x – 6)=462-206
    2(x – 6)=256
    x – 6=256:2
    x – 6=128
    x=128+6
    vậy x = 134

  2. 2678 : [462 – 2(x + 6)] = 13
    462 – 2(x + 6) = 2678 : 13
    462 – 2(x + 6) = 206
    2(x + 6) = 462 – 206
    2(x + 6) = 256
    x + 6 = 256 : 2
    x + 6 = 128
    x = 128 – 6
    x = 122
    ______________________
    2678 : [462 – 2(x – 6)] = 13
    462 – 2(x – 6) = 2678 : 13
    462 – 2(x – 6) = 206
    2(x – 6) = 462 – 206
    2(x – 6) = 256
    x – 6 = 256 : 2
    x – 6 = 128
    x = 128 + 6
    x = 134
     

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

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