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

Toán Lớp 6: 4. Thực hiện phép tính (tính nhanh nếu có thể): a) 215 + (–38) – (–58) + 90 – 85 b) 31 – [26 – (209 + 35)] c) 315 – (41 + 215) d) 917 –

Tháng Ba 20, 2023 Toán học 1 Comment 0 views

Toán Lớp 6: 4. Thực hiện phép tính (tính nhanh nếu có thể):
a) 215 + (–38) – (–58) + 90 – 85
b) 31 – [26 – (209 + 35)]
c) 315 – (41 + 215)
d) 917 – (417 – 65)
e) (29 + 37 + 13) + (10 – 37 – 13)
f) (79 + 32 – 35) – (69 + 12 – 75)
g) – (– 125 + 63 + 57) – (10 – 83 – 37)
h) 434 + (–100) + (–434) + 700
i) 6830 + (–993) + 170 + (–5007)
j) 31 + 32 + 33 + 34 + 35 – 11 – 12 – 13 – 14 – 15
k) (67 – 5759) + 5759
l) (-3023) – (765 – 3023)
m) 631 + [587 – (287 + 231)]
n) (-524) – [(476 + 245) – 45]

Comments ( 1 )

  1. truongthanhhung
    truongthanhhung
    20 Tháng Ba, 2023 at 12:49 chiều
    Reply
    a) 215 + (-38) – (-58) + 90 – 85
    = 215 – 38 + 58 + 90 – 85
    = 177 + 148 – 85
    = 325 – 85
    = 240
    b) 31 – [26 – (209 + 35)]
    = 31 – 26 – 209 – 35
    = 5 – 209 – 35
    = -204 – 35
    = -239
    c) 315 – (41 + 215)
    = 315 – 41 – 215
    = (315 – 215) – 41
    = 100 – 41
    = 59
    d) 917 – (417 – 65)
    = 917 – 417 + 65
    = 500 + 65
    = 565
    e) (29 + 37 + 13) + (10 – 37 – 13)
     = 29 + 37 + 13 + 10 – 37 – 13
     = (37 – 37) + (13 – 13) + (29 + 10)
     = 39
    f) (79 + 32 – 35) – (69 + 12 – 75)
     = 79 + 32 – 35 – 69 – 12 + 75
     = (79 – 69) + (32 – 12) + (75 – 35)
     = 10 + 20 + 40
     = 70
    g) -(-125 + 63 + 57) – (10 – 83 – 37)
     = 125 – 63 – 57 – 10 + 83 + 37
     = (125 – 10) + (83 + 37) + (- 63 – 57)
     = 115 + 120 – 120
     = 115
    h) 434 + (-100) + (-434) + 700
     = 434 + (-434) + 700 + (-1000)
     = 600
    i) 6830 + (-993) + 170 + (-5007)
     = 6830 + 170 + (-993) + (-5007)
     = 1000
    k) (67 – 5759) + 5759 = 67 – 5759 + 5759 = 67
    l) (-3023) – (765 – 3023) = -3023 – 765 + 3023 = -765
    m) 631 + [587 – (287 + 231)] = 631 + (587 – 287 – 231)
     = 631 + (300 – 231) 
     = 631 + 300 – 231
     = 400 + 300  
     = 700
    n) (-524) – [(467 + 245) – 45]
     = -524 – 476 – 200
     = -1000 – 200
     = -1200
     

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

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