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

Toán Lớp 7: Tìm x Tìm x a)(x-1/4)^2=1/9 b)(x-1/4)^3=1/27

Toán Lớp 7: Tìm x
Tìm x
a)(x-1/4)^2=1/9
b)(x-1/4)^3=1/27

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    a) (x-1/4)^2 = 1/9
    => (x-1/4)^2 = (+-1/3)^2
    => x -1/4 = 1/3 hoặc x – 1/4 = -1/3
    => x = 1/3 + 1/4 hoặc x = -1/3 + 1/4
    => x  = 4/12 + 3/12 hoặc x = -4/12 + 3/12
    => x = 7/12 hoặc x = -1/12
    Vậy x in { 7/12 ; -1/12 }
    b) (x-1/4)^3 = 1/27
    => ( x -1/4)^3 = (1/3)^3
    => x -1/4 = 1/3
    => x = 1/3 + 1/4
    => x = 4/12 + 3/12
    => x = 7/12
    Vậy x = 7/12
    $#Vịt vàng$

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

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