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

Toán Lớp 7: a) 3/2.4/9+3/2.5/9 b) 5^8:5^6+(2019-2018)^5_2020 help me

Toán Lớp 7: a) 3/2.4/9+3/2.5/9
b) 5^8:5^6+(2019-2018)^5_2020
help me

Comments ( 2 )

  1. a)
    3/2. 4/9 + 3/2. 5/9
    = 3/2. ( 4/9 + 5/9 )
    = 3/2. 1
    = 3/2
    b)
    5^8 : 5^6 + ( 2019 – 2018 )^5 – 2020^0
    = 5^2 + 1^5 – 1
    = 25 + 1 – 1
    = 25
     

  2. Giải đáp:
    Bạn tham khảo nhé.
    Lời giải và giải thích chi tiết:
    $a)\,\dfrac32\!\cdot\!\dfrac49+\dfrac32\!\cdot\!\dfrac59\\=\dfrac32\left(\dfrac49+\dfrac59\right)\\=\dfrac32\!\cdot\!1\\=\dfrac32\\b)\,5^8:5^6+\left(2019-2018\right)^5-2020\\=5^2+1^5-2020^0\\=25+1-1\\=25$

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