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

Toán Lớp 6: Tính hai cách a)=18.15-3.6.10 b)=39.(29-13)-29.(39-13)

Toán Lớp 6: Tính hai cách
a)=18.15-3.6.10
b)=39.(29-13)-29.(39-13)

Comments ( 2 )

  1. a/
    18 . 15 – 3 . 6 . 10
    18 .1 5 – 18 . 10
    = 18(15 -10)
    = 18 . 5
    = 90
    $\\$
    18 . 15 – 3 . 6 . 10
    = 18 .15 – 18 .10
    =270 -180
    = 90
    $\\$
    b/
    39(29-13) – 29(39-13)
    = 39 . 16 – 29 . 26
    = 624 -754
    = -130
    $\\$
    39(29-13) -29(39-13)
    = 39 . 29 – 39 . 13 – 29 . 39 + 29 . 13
    = (39 . 29 – 29 . 39) + (- 39 . 13 + 29 . 13)
    = -507 + 377
    =-130

  2. a)cách 1=18.15-3.6.10
    =18.15-18.10
    =18.(15-10)
    =18.5
    =70
    cách 2
    18.15-3.6.10
    =250-180
    =70
    b)cách 1
    39.(29-13)-29.(39-13)
    =39.29-39.13-29.39-29.13
    =0
    cách 2
    39.(29-13)-29.(39-13)
    =39.16-29.26
    =0

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

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