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

Toán Lớp 5: 5/4×2/3+4/5 giải toán giúp em ạ

Toán Lớp 5: 5/4×2/3+4/5 giải toán giúp em ạ

Comments ( 2 )

  1. 5/4 × 2/3 + 4/5
    = (5 × 2)/(4 × 3) + 4/5
    = (5 × 2)/(2 × 2 × 3) + 4/5
    = 5/(2 × 3) + 4/5
    = 5/6 + 4/5
    = (5 × 5)/(6 × 5) + (4 × 6 )/(5 × 6)
    = 25/30 + 24/30
    = (25 + 24)/30
    = 49/30
     
     

  2. 5/4 × 2/3 + 4/5
    = 5/6 + 4/5
    = 25/30 +24/30
    = 49/30
    @Zun
     

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