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

Toán Lớp 5: Tính bằng cách hợp lý a, 11/12-2/3+1/4 b, 190 x 64 + 190 x 3 c, 2001 x 2020 – 2000

Toán Lớp 5: Tính bằng cách hợp lý
a, 11/12-2/3+1/4
b, 190 x 64 + 190 x 3
c, 2001 x 2020 – 2000

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     $\text{a) $\dfrac{11}{12}$ – $\dfrac{2}{3}$ + $\dfrac{1}{4}$}$
    = 11/12 – 2/3 + 1/4
    = 1/4 + 1/4
    = 1/2
    ____________________________
      b) 190 × 64 + 190 × 3
    = 190 × (64 + 3)
    = 190 × 67
    = 12730
    _____________________________
       c) 2001 × 2020 – 2000
    = (2000 + 1) × 2020 – 2000
    = 2020 × 2000 + 2020 – 2000
    = 2000 × 2020 + 20
    = 4040000 + 20
    = 4040020

  2. a)
    11/12 – 2/3 + 1/4
    = 11/12 – 8/12 + 3/12
    = (11 – 8 + 3)/12
    = 6/12 = 1/2
    b)
    190 × 64 + 190 × 3
    = 190 × (64 + 3)
    = 190 × 67
    = 12730
    c)
    2001 × 2020 – 2000
    = (2000 + 1) × 2020 – 2000
    = 2000 × 2020 + 2020 – 2000
    = 2000 × 2020 + 20
    = 4040000 + 20
    = 4040020

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