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

Toán Lớp 6: Tính nhanh : 19.43 + (-20).43 – (-40) a) 15.(-236) + 15.235 b) 237.(-28) + 28.137 c) 38.(27 – 44) – 27.(38 – 44)

Home/ Toán Lớp 6: Tính nhanh : 19.43 + (-20).43 – (-40) a) 15.(-236) + 15.235 b) 237.(-28) + 28.137 c) 38.(27 – 44) – 27.(38 – 44)

Toán Lớp 6: Tính nhanh : 19.43 + (-20).43 – (-40) a) 15.(-236) + 15.235 b) 237.(-28) + 28.137 c) 38.(27 – 44) – 27.(38 – 44)

Tháng Mười Một 8, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Tính nhanh :
19.43 + (-20).43 – (-40)
a) 15.(-236) + 15.235
b) 237.(-28) + 28.137
c) 38.(27 – 44) – 27.(38 – 44)

Comments ( 2 )

  1. maingoctruc
    maingoctruc
    8 Tháng Mười Một, 2022 at 5:39 sáng
    Reply
    19.43+(-20).43-(-40)
    =43(19-20)+40
    =-43+40
    =-3
    a) 15 ⋅ (−236) + 15 ⋅ 235
    = 15 ⋅ (−236 + 235)
    = 15 ⋅ (−1)
    = −15
    237 ⋅ (−28) + 28 ⋅ 137
    = −237 ⋅ 28 + 28 ⋅ 137
    = 28 ⋅ (−237 + 137)
    = 28 ⋅ (−100)
    = −2800
    c.38 ⋅ (27 − 44) − 27 ⋅ (38 − 44)
    = (38 ⋅ 27 − 38 ⋅ 44) − (27 ⋅ 38 − 27 ⋅ 44)
    = 38 ⋅ 27 − 38 ⋅ 44 − 27 ⋅ 38 + 27 ⋅ 44
    = 38 ⋅ 27 − 27 ⋅ 38 − 38 ⋅ 44 + 27 ⋅ 44
    = −38 ⋅ 44 + 27 ⋅ 44
    = 44 ⋅ (−38 + 27)
    = 44 ⋅ (−11)
    = −484
     

  2. aivilanlan
    aivilanlan
    8 Tháng Mười Một, 2022 at 5:38 sáng
    Reply
    a) 19 . 43 + -20 . 43 – -40
    = (19 + -20) . 43 + 40
    = -1 . 43 + 40
    = -43 + 40
    = -3
    b) 15 . -236 + 15 . 235
    = 15 . (-236 + 235)
    = 15 . -1
    = -15
    c) 237 . -28 + 28 . 137
    = -237 . 28 + 28 . 137
    = (-237 + 137) . 28
    = -100 . 28
    = -2800
    d) 38 . (27 – 44) – 27 . (38 – 44)
    = 38 . 27 – 38 . 44 – 27 . 38 – 27 . 44
    = 38 . 27 – 27 . 38 – 38 . 44 + 27.44
    = -38 . 44 + 27 . 44
    = (-38 + 27) . 44
    = -11 . 44
    = -484
     

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

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