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

Toán Lớp 7: bài 2 : đặt tính rồi tính A) (3/2 – 2/5 + 1/10) : (3/2 – 2/3 + 1/12 ) B) 1/2020+1/2021- 1/2022 ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡

Toán Lớp 7: bài 2 : đặt tính rồi tính
A) (3/2 – 2/5 + 1/10) : (3/2 – 2/3 + 1/12 )
B) 1/2020+1/2021- 1/2022
≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ +1
3/2020+3/2021- 3/2022

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a) (3/2 – 2/5 +  1/10) : (3/2 – 2/3 + 1/12)
    = (11/10 + 1/10) : ( 5/6 + 1/12)
    = 6/5 : 11/12
    = 72/55
    b) (1/2020 + 1/2021 – 1/2022)/(3/2020 + 3/2021 – 3/2022) + 1
    = (1/2020 + 1/2021 – 1/2022)/(3 . (1/2020 + 1/2021 – 1/2022)) + 1
    = 1/3 + 1
    = 4/3

  2. a)
    (3/2 – 2/5 + 1/10) : (3/2 – 2/3 + 1/12)
    = (3/2 – 3/10) : (3/2 – 7/12)
    = 6/5 : 11/12
    = 72/55
    b)
    (1/2020 + 1/2021 – 1/2022)/(3/2020 + 3/2021 – 3/2022) + 1
    (1/2020 + 1/2021 – 1/2022)/(3 . (1/2020 + 1/2021 – 1/2022) + 1
    = 1/3 + 1
    = 4/3
     

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

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