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

Toán Lớp 7: Tìm x x/2008-1/10-1/15-1./21-…-1/120=5/8

Toán Lớp 7: Tìm x
x/2008-1/10-1/15-1./21-…-1/120=5/8

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    x/2008 – 1/10 – 1/15 – 1/21 -…….- 1/120 = 5/8
    -> x/2008 – [2 . ( 1/20 + 1/30 + 1/42 +…….+ 1/240 )] = 5/8
    -> x/2008 – [2 . (1/4.5 + 1/5.6 + 1/6.7 +…..+ 1/15,16 )] =5/8
    -> x/2008 – [2 . ( 1/4 – 1/5 + 1/5 – 1/6 + 1/6 – 1/7 +…..+ 1/5 – 1/16 )] = 5/8
    -> x/2008 – [ 2 . 3/16 ] = 5/8
    -> x/2008 = 5/8 + 3/8
    -> x/2008 = 1
    -> x=1 . 2008
    -> x=2008
    #Dung09

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

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