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

Toán Lớp 6: Bài 1. Thực hiện phép tính (hợp lý nếu có thể): n) 1024 : 25 + 140 : (38+ 25) – 723 : 7+21 o) 36. 55 – 185. 11 + 121. 5 p) 98. 42 – 50.

Toán Lớp 6: Bài 1. Thực hiện phép tính (hợp lý nếu có thể):
n) 1024 : 25 + 140 : (38+ 25) – 723 : 7+21
o) 36. 55 – 185. 11 + 121. 5
p) 98. 42 – 50.[(18 – 23): 2 + 32]
q) 407 – [(190 – 170) : 4 + 9]
r) (23. 36 – 37. 36 – 36) : 36
s) 3. 52 – 27 : 32 – 52. 4 – 18 : 32

Comments ( 2 )

  1. n) 1024 : 25 + 140 : (38+ 25) – 723 : 7+21
    = 1024 : 25 + 140 : 38 + 140 : 25 – 723/7 + 21
    = ( 1024 + 140 ) : 25 + ( 5,6 – 23/7 + 21 )
    = 1164 : 25 + 816/35
    = 46,56 + 816/35
    = 12228/175
    o) 36. 55 – 185. 11 + 121. 5
    = 36 . 55 – 37 . 11 . 5 + 11 . 11 . 5
    = 55 . 36 – 55 . 37 + 55 . 11
    = 55 . ( 36 – 37 + 11 )
    = 55 . 10
    = 550
    p) 98 . 42 – 50 . [ ( 18 – 23 ) : 2 + 32 ]
    = 98 . 42 – 50 . [ – 5 : 2 + 32 ]
    = 4116 – 50 . 29,5
    = 4116 – 1475
    = 2641
    q) 407 – [ ( 190 – 170 ) : 4 + 9 ]
    = 407 – [ 20 : 4 + 9 ]
    = 407 + 3 – 5 + 6
    = 410 + 1
    = 411
    r) (23. 36 – 37. 36 – 36) : 36
    = [ 36 . ( 23 – 37 – 1 )  ] : 36
    = [ 36 . ( – 15 ) ] : 36
    = – 540 : 36
    = – 15
    s) 3. 52 – 27 : 32 – 52. 4 – 18 : 32
    = 52 . ( 3 – 4 ) – ( 27/32 + 18/32 )
    = – 52 – 45/32
    = – 1709/32
     

  2. Bài  1:
    n) 1024/25 + 140/(38+25) – 723/7 + 21
    = 40,96 + 20/9 – 576/7
    = 40,96 – 5044/63
    = -39,10349206
    o) 36.55 – 185.11 + 121.5
    = 36.5.11 – 185.11 + 11.11.5
    = 11.(  180 – 185 + 55 )
    = 11. 50
    = 550
    p) 98,42 – 50.[(18 – 23)/2 + 32]
    = 98,42 – 50.(-2,5 + 32)
    = 98,42 – 50.29,5
    = -1376,58
    q) 407 – [(190 – 170)/4 + 9]
    = 407 – ( 5 + 9 )
    = 407 – 14
    = 393
    r) (23. 36 – 37. 36 – 36)/36
    = [36.( 23 – 37 – 1)]:36
    = (-15.36)/36
    = -15
    s) 3.52 – 27/32 – 52.4 – 18/32
    = 52.( 3 – 4) – (27-18)/32
    =-52 – 9/32
    =-52,28125
     

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

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