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

Toán Lớp 6: Tìm x 1+35+-+x=3200 (xla số lẻ)

Toán Lớp 6: Tìm x 1+35+….+x=3200 (xla số lẻ)

Comments ( 2 )

  1. Tìm x:
    1+35+…+x=3200
    34:(x-1)+(x+1):2=3200
    (34-2).(x-1)=3200
    32.(x-1)=3200
    x-1=3200:32
    x-1=100
    x=1+100
    x=101
    Vậy x=101

  2. 1+35+….+x=3200
    →34:(x-1)+(x+1):2=3200
    (x-1)(34-2)=3200
    (x-1).32=3200
    x-1=3200:32
    x-1=100
    x=100+1
    x=101
    ⇒x=101

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