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

Toán Lớp 7: tìm x ; ( x + 1 ) + ( x + 3 ) + ( x + 5 ) + –.. + ( x + 399 ) = 40400

Toán Lớp 7: tìm x ;
( x + 1 ) + ( x + 3 ) + ( x + 5 ) + ………. + ( x + 399 ) = 40400

Comments ( 2 )

  1. (x+1)+(x+3)+(x+5)+…+(x+399)=40400
    ->x+1+x+3+x+5+…+x+399=40400
    ->(x+x+x+….+x)+(1+3+5+…+399)=40400
    ->200x+40000=40400
    ->200x=400
    ->x=2
    Vậy x=2
    #Wuang
     

  2. Giải đáp:
    ( x + 1 ) + ( x + 3 ) + ( x + 5 ) + ………. + ( x + 399 ) = 40400
    x+1+x+3+x+5+……………….+x+399=40400
    200x+40000=40400
    200x=400
    x=2
    Lời giải và giải thích chi tiết:
     

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