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

Toán Lớp 5: a) `1/3` + `1/5` + `1/30` = `?` b) `1/3` + `1/4` + `1/5` = `?`

Toán Lớp 5: a) 1/3 + 1/5 + 1/30 = ?
b) 1/3 + 1/4 + 1/5 = ?

Comments ( 2 )

  1. a, 1/3 + 1/5 + 1/30
    = 10/20 + 6/30 + 1/30
    = (10 + 6 + 1)/30 = 17/30
    b, 1/3 + 1/4 + 1/5
    = 20/60 + 15/60 + 12/60
    = (20 + 15 + 12)/60 = 47/60

  2. text{Giải đáp + Lời giải và giải thích chi tiết :}
     a) 1/3 + 1/5 + 1/30 ( text{MSC : 30} )
    => (1xx10)/(3xx10) + (1xx6)/(5xx6) + 1/30
    => 10/30 + 6/30 + 1/30 
    => (10+6+1)/30 .
    b) 1/3 + 1/4 + 1/5 ( text{MSC : 60} )
    => (1xx20)/(3xx20) + (1xx15)/(4xx15) + (1xx12)/(5xx12)
    => 20/60 + 15/60 + 12/60 
    => (20+15+12)/60
    => 47/60 . 
    text{@muoiakiramobile}
                                          text{Xin hay nhất !}

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