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

Toán Lớp 7: A/ -4/9+1/3 -(-5/6) B/ -7/12 -(-14/15)+(-5/6) C/ 2/3-[(-7/4-(1/2+3/8)]

Tháng Mười 29, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: A/ -4/9+1/3 -(-5/6)
B/ -7/12 -(-14/15)+(-5/6)
C/ 2/3-[(-7/4-(1/2+3/8)]

Comments ( 2 )

  1. khanhlanchau
    khanhlanchau
    29 Tháng Mười, 2022 at 11:02 sáng
    Reply
    -4/9+1/3 -(-5/6)
    =-1/9 -(-5/6)
    =13/18
    -7/12 -(-14/15)+(-5/6)
    =7/20 + (-5/6)
    =-29/60
    2/3-[(-7/4-(1/2+3/8))]
    =2/3-[(-7/4-7/8]
    =2/3 – (-21/8)
    =79/24

  2. hienthucthu97
    hienthucthu97
    29 Tháng Mười, 2022 at 11:01 sáng
    Reply
    a)
    -4/9 + 1/3 – (-5/6)
    =  -4/9 + 1/3 + 5/6
    = -8/18 + 6/18 + 15/18
    = 13/18
    b)
    -7/12 – (-14/15) + (-5/6)
    = -7/12 + 14/15 – 5/6
    = -35/60 + 56/60 – 50/60
    = -29/60
    c)
    2/3 – [ -7/4 – (1/2 + 3/8)]
    = 2/3 – (-7/4 – 1/2 – 3/8)
    = 2/3 + 7/4 + 1/2 + 3/8
    = 16/24 + 42/24 + 12/24 + 9/24
    = 79/24

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

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