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

Toán Lớp 6: tính hợp lý a 63.(64-62)+62.(62-64) b 37 . ( 25+ 27 ) – 27 . ( 37 + 25)

Tháng Bảy 9, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: tính hợp lý
a 63.(64-62)+62.(62-64)
b 37 . ( 25+ 27 ) – 27 . ( 37 + 25)

Comments ( 2 )

  1. ngocle44
    ngocle44
    9 Tháng Bảy, 2022 at 6:41 chiều
    Reply
    $\text{ @HV }$
    $\text{ a) 63.(64 – 62) + 62.(62 – 64) }$
    $\text{ = 63.64 – 63.62 + 62.62 – 62.64 }$
    $\text{ = (63.64 – 62.64) – (63.62 – 62.62) }$
    $\text{ = 64.(63 – 62) – 62.(63-62) }$
    $\text{ = (64 – 62).(63 – 62) }$
    $\text{ = 2.1 }$
    $\text{ = 2 }$
    $\text{ b) 37.(25 + 27) – 27.(37 + 25) }$
    $\text{ = 37.25 + 37.27 – 27.37 – 27.25 }$
    $\text{ = (37.25 – 27.25) + (37.27 – 27.37) }$
    $\text{ = 25.(37 – 27) }$
    $\text{ = 25.10 }$
    $\text{ = 250 }$

  2. kimoanh34
    kimoanh34
    9 Tháng Bảy, 2022 at 6:40 chiều
    Reply
    a)
    63.(64-62)+62.(62-64)
    63.(64 – 62) + 62. (62- 64)
    = 63. 2 + 62. (-2)
    = 2. (63 – 62)
    = 2 .1
    = 2
    b)
    37.(25 + 27) – 27. (37+ 25)
    = 37.25 + 37.27 – 27.37 – 27.25
    = 37.25 – 27.25
    = 25. (37 – 27)
    = 25. 10
    = 250
     

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

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