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

Toán Lớp 5: 1+2+3+4+…+x=1225

Toán Lớp 5: 1+2+3+4+…+x=1225

Comments ( 2 )

  1. 1+2+3+4+…+x=1225
    (x+1)×(x1+1):2=1225
    (x+1)×x=1225×2=2450=49×50
    x=49

  2. Giải đáp:
    1+2+3+4+…+x=1225
    ⇒(x+1)×(x−1+1):2=1225
    ⇒(x+1)×x=1225×2=2450=49×50
    ⇒x=49
       Xin hay nhất !!!
    #ebein2009
    #nocopy
     

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

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