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

Toán Lớp 6: 1. Tính a , 2 023 – 25² : 5³ + 27 ; b , 60 : [ 7 . ( 11² – 20 . 6 ) + 5 ] 2 . Tìm số tự nhiên x , biết : a , ( 9 x – 2³ ) : 5 = 2

Toán Lớp 6: 1. Tính
a , 2 023 – 25² : 5³ + 27 ;
b , 60 : [ 7 . ( 11² – 20 . 6 ) + 5 ]
2 . Tìm số tự nhiên x , biết :
a , ( 9 x – 2³ ) : 5 = 2
b , [ 3⁴ – ( 8² + 14 ) : 13 ] x = 5³ + 10²
3. Sở dụng máy tính cầm tay để tính
a , 2 027² – 1 973²
b , 4² + ( 365 – 289 ) . 71 .

Comments ( 2 )

  1. Bài 1:
    a)2023-25^2:5^3+27
    =2023-(5^2)^2:5^3+27
    =2023-5^4:5^3+27
    =2023-5+27
    =2045
    b)60:[7.(11^2-20.6)+5]
    =60:[7.(121-120)+5]
    =60:(7.1+5)
    =60:15
    =2
    Bài 2:
    a)(9x-2^3):5=2
    9x-8=10
    9x=18
    x=2
    Vậy x=2
    b) [ 3^4 – (8^2 + 14):13].x = 5^3 + 10^2
    [81 – (64 + 14):13].x = 125 + 100
    [81 – 78:13].x = 225
    [81 – 6].x = 225
    75x = 225
    x = 225:75
    x = 3
    Vậy x = 3
    Bài 3:
    a)2027^2-1973^2=216000
    b)4^2+(365-289).71=5412

  2. 1
    a ) 2023 – 25^2 : 5^3 + 27
    = 2023 – 5^4 : 5^3 + 27
    = 2023 – 5^1 + 27
    = 2023 – 5 + 27
    = 2018 + 27
    = 2045
    b ) 60 : [7 . (11^2 – 20 . 6) + 5]
    = 60 : [7 . ( 121 – 120 ) + 5]
    = 60 : [7 . 1 + 5]
    = 60 : [7 + 5]
    = 60 : 12
    = 5
    2
    a ) (9x – 2^3 ) : 5 = 2
    9x – 8= 2 . 5
    9x – 8= 10
    9x = 10 + 8
    9x = 18
       x = 18 : 9
        x = 2
    Vậy x = 2
    b ) [3^4 – ( 8^2 + 14 ) : 13]x = 5^3 + 10^2
    [81 – ( 64 + 14 ) : 13]x = 125 + 100
    [81 – 78 : 13]x = 225
    [81 – 6]x = 225
    75x = 225
        x = 225 : 75
        x = 3
    Vậy x = 3
    3
    a ) 2027^2 – 1973^2 = 216000
    b ) 4^2 + ( 365 – 289 ) . 71 = 5412
    #dtkc
     

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

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