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

Toán Lớp 6: a) 3784+23 – 3785 -15 b) 21+22 +23 + 24 – 11- 12-13-14 c) -2001 + ( 1999+ 2021) d) (42- 863) – ( 137-57)

Home/ Toán Lớp 6: a) 3784+23 – 3785 -15 b) 21+22 +23 + 24 – 11- 12-13-14 c) -2001 + ( 1999+ 2021) d) (42- 863) – ( 137-57)

Toán Lớp 6: a) 3784+23 – 3785 -15 b) 21+22 +23 + 24 – 11- 12-13-14 c) -2001 + ( 1999+ 2021) d) (42- 863) – ( 137-57)

Tháng Tám 8, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: a) 3784+23 – 3785 -15
b) 21+22 +23 + 24 – 11- 12-13-14
c) -2001 + ( 1999+ 2021)
d) (42- 863) – ( 137-57)

Comments ( 2 )

  1. hiennhi98
    hiennhi98
    8 Tháng Tám, 2022 at 1:28 chiều
    Reply
    Lời giải và giải thích chi tiết:
    a)
    3784 + 23 – 3785 – 15
    = 3784 + 23 – (3784 + 1) – 15
    = 3784 + 23 – 3784 – 1 – 15
    = 23 – 1 – 15
    = 7
    b)
    21 + 22 + 23 + 24 – 11 – 12 – 13 – 14
    = (21 – 11) + (22 – 12) + (23 – 13) + (24 – 14)
    = 10 + 10 + 10 + 10
    = 40
    c)
    -2001 + (1999 + 2021)
    = -2001 + (2001 + 2019)
    = -2001 + 2001 + 2019
    = 2019
    d)
    (42 – 863) – (137 – 57)
    = 42 – 863 – 137 + 57
    = -821 – 137 + 57
    = -958 + 57
    = -901

  2. minhtamnguyet88
    minhtamnguyet88
    8 Tháng Tám, 2022 at 1:28 chiều
    Reply
    a) 3784 + 23 – 3785 – 15
    = 3807 – 3785 – 15
    = 22 – 15
    = 7
    b) 21 + 22 + 23 + 24 -11 – 12 -13 – 14
    = 43 + 23 + 24 – 11 – 12 – 13 – 14
    = 66 + 24 – 11 – 12 – 13 – 14
    = 90 – 11 – 12 – 13 – 14
    = 79 – 12 – 13 – 14
    = 67 – 13 – 14
    = 54 – 14
    = 40
    c) -2001 + ( 1999 + 2021 )
    = -2001 + 4020
    = 2019
    d) ( 42 – 863 ) – ( 137 – 57 )
    = -821 – 80
    = -901

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

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