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

Toán Lớp 6: Tìm số tự nhiên x, biết : x + ( x + 1 ) + ( x + 2 ) + … + ( x + 99 ) = 5450

Toán Lớp 6: Tìm số tự nhiên x, biết :
x + ( x + 1 ) + ( x + 2 ) + … + ( x + 99 ) = 5450

Comments ( 2 )

  1. \(x+\left(x+1\right)+\left(x+2\right)+…..+\left(x+99\right)=5450\)
    \(\Leftrightarrow\left(x+x+…..+x\right)+\left(1+2+….+99\right)=5450\)
    \(\Leftrightarrow100x+\dfrac{\left(99+1\right).99}{2}=5450\)
    \(\Leftrightarrow100x+4950=5450\)
    \(\Leftrightarrow x=5\)
    Vậy x=5
    @thew

  2. x + ( x + 1 ) + ( x + 2 ) + … + ( x + 99 ) = 5450
    x + x + 1 + x + 2 + … + x + 99 = 5450
    ( x + x + … + x ) + ( 1 + 2 + 3 + … + 99 ) = 5450
    100 x + 4950 = 5450
    100 x = 500
    x = 5
     

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

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