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

Toán Lớp 5: a 6/25:21/20 40/7×14/15 17/13:51/26

Toán Lớp 5: a 6/25:21/20 40/7×14/15 17/13:51/26

Comments ( 2 )

  1. Giải đáp:
    a, 6/25 : 21/20
    = 6/25 × 20/21
    = ( 6 × 20 )/( 21 ×21 )
    = 8/35
    b, 40/7 × 14/15
    = ( 40 × 14 )/( 7 × 15 )
    = 16/3
    c, 17/13 : 51/26
    = 17/13 × 26/51
    = ( 17 × 16 )/( 13 × 51 )
    = 2/3
    @Akira2007  
     

  2. a) 6/(25):(21)/(20)
    =(6)/(25)xx(20)/(21)
    =(6xx20)/(25xx21)
    =8/(35)
    b) (40)/(7)xx(14)/(15)
    =(40xx14)/(7xx15)
    =(16)/3
    c) (17)/(13):(51)/(26)
    =(17)/(13)xx(26)/(51)
    =(17xx26)/(13xx51)
    =2/3
     

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