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

Toán Lớp 7: A) 2^3×4^2/8^3 B) 27^2×9/81 C) 27^2÷9^3 D) 6^2÷3^3/12^3

Tháng Mười 26, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: A) 2^3×4^2/8^3
B) 27^2×9/81
C) 27^2÷9^3
D) 6^2÷3^3/12^3

Comments ( 1 )

  1. hoquyly
    hoquyly
    26 Tháng Mười, 2022 at 8:30 sáng
    Reply
    a) ( 2^3 . 4^2 )/( 8^3 )
    = ( 2^3 . ( 2^2 )^2 )/( ( 2^3 )^3 )
    = ( 2^3 . 2^4 )/( 2^9 )
    = 2^7/2^9 = 1/2^2
    = 1/4
    b) ( 27^2 . 9 )/81
    = ( ( 3^3 )^2 . 3^2 )/( 3^4 )
    = ( 3^6 . 3^2 )/( 3^4 )
    = ( 3^8 )/3^4 = 3^4
    = 81
    c) 27^2 : 9^3
    = ( 3^3 )^2 : ( 3^2 )^3
    = 3^6 : 3^6
    = 1
    d) ( 6^2 : 3^3 )/( 12^3 )
    = ( ( 2 . 3 )^2 : 3^3 )/( 12^3 )
    = ( 2^2 . 3^2 : 3^3 )/( 12^3 )
    = ( 2^2 : 3 )/1728
    = 4/3 : 1728
    = 1/1296

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

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