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

Toán Lớp 6: i) ( -4/ 5 + 4/3 ) + (-5/4 + 14/5 ) -7/3 j ) 8 /3 . 2/5 . 3/8 .10 .10 /92 k) -5/7 . 2/11 + -5 /7 . 9/14 + 12/7 l) 12/ 19 . 7 /15 . –

Toán Lớp 6: i) ( -4/ 5 + 4/3 ) + (-5/4 + 14/5 ) -7/3
j ) 8 /3 . 2/5 . 3/8 .10 .10 /92
k) -5/7 . 2/11 + -5 /7 . 9/14 + 12/7
l) 12/ 19 . 7 /15 . -13 /17 .19/12 .17/13

Comments ( 2 )

  1. i) (-4/5 + 4/3) + (-5/4 + 14/5) – 7/3
    = -4/5 + 4/3 – 5/4 + 14/5 – 7/3
    = (-4/5 + 14/5) + (4/3 – 7/3) – 5/4
    = 2 + (-1) – 5/4
    = 1 – 5/4
    = -1/4
    j) 8/3 . 2/5 . 3/8 . 10 . 10/92
    = ( 8/3 . 3/8) . ( 2/5 . 10/92) . 10
    = 1 . 1/23 . 10
    = 10/23
    k) -5/7 . 2/11 + (-5/7) . 9/14+ 12/7
    = -5/7 . ( 2/11 + 9/14) + 12/7
    = -5/7 . 71/154 + 12/7
    = -355/1078 + 12/7
    = 1493/1078
    l) 12/19 . 7/15 . (-13/17) . 19/12 . 17/13
    = (12/19 . 19/12) . ( -13/17 . 17/13) . 7/15
    = 1 . (-1) . 7/15
    = -7/15

  2. Giải đáp:
    Azzuri#
    i)
    (-4/5 + 4/3) + (-5/4 + 14/5) – 7/3
    = -4/5 + 4/3 – 5/4 + 14/5 – 7/3
    = (-4/5 + 14/5) + (4/3 – 7/3) – 5/4
    = 2 + (-1) – 5/4
    = 1 – 5/4
    = -1/4
    j)
    8/3 . 2/5 . 3/8 . 10 . 10/92
    = ( 8/3 . 3/8) . ( 2/5 . 10/92) . 10
    = 1 . 1/23 . 10
    = 10/23
    k)
    -5/7 . 2/11 + (-5/7) . 9/14+ 12/7
    = -5/7 . ( 2/11 + 9/14) + 12/7
    = -5/7 . 71/154 + 12/7
    = -355/1078 + 12/7
    = 1593/1078
    l)
    12/19 . 7/15 . (-13/17) . 19/12 . 17/13
    = (12/19 . 19/12) . ( -13/17 . 17/13) . 7/15
    = 1 . (-1) . 7/15
    = -7/15
    Lời giải và giải thích chi tiết:
     

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